diff --git a/README.md b/README.md
index eefbad1..af3dec2 100644
--- a/README.md
+++ b/README.md
@@ -173,13 +173,41 @@ using var response = await http.SendAsync(request);
 response.EnsureSuccessStatusCode();
 ```
 
+## Multitenant napojení klientů (CSBOT MS365 Connector)
+
+Služba je stavěná pro jednu multitenant Entra aplikaci CSBOT, přes kterou se připojují
+Microsoft 365 tenanty jednotlivých klientů. Podrobné zadání je v Notion stránce
+"MS365 práva konektoru".
+
+- `MS365_CLIENT_ID` a `MS365_CLIENT_SECRET` patří aplikaci CSBOT a jsou pro všechny klienty stejné.
+- `MS365_TENANT_ID` je tenant konkrétního klienta. Token se získává proti
+  `https://login.microsoftonline.com/{tenant klienta}/oauth2/v2.0/token`.
+- Při volání za různé klienty se tenant id posílá v hlavičce `X-MS365-Tenant-Id`
+  (viz "Credentials v request hlavičkách"), client id a secret zůstávají stejné.
+- Klient nevytváří vlastní App Registration ani nepředává secret. Jeho administrátor jen
+  schválí admin consent. URL pro consent vrací `GET /admin-consent/url?redirect_uri=...&state=...`
+  (bere tenant id a client id z hlaviček nebo z env). Callback po consentu (parametry `tenant`
+  a `admin_consent=True`) zpracovává backend CSBOT, ne tato služba.
+- Služba je bezstavová a neověřuje, zda mailbox, plan id nebo bucket id patří danému
+  zákazníkovi. Tenant isolation (customer id -> tenant id, mailbox, plan id, bucket id)
+  musí držet volající backend, hodnoty nesmí přicházet přímo od LLM.
+
+Postup testu po consentu klienta: `GET /status`, `GET /users/{mailbox}/calendar/view`,
+`POST /users/{mailbox}/calendar/events` + `DELETE`, `GET /planner/plans/{plan_id}/tasks`,
+`POST /planner/tasks` + `DELETE`.
+
 ## Implementované služby
 
 - Users: výpis a načtení uživatelů.
 - Mail: výpis zpráv a odesílání e-mailů včetně příloh.
-- Calendar: výpis a vytváření událostí včetně Teams online meetingů.
+- Calendar: výpis událostí, calendarView v zadaném rozsahu, volné termíny (getSchedule),
+  načtení, vytvoření, úprava a smazání události včetně Teams online meetingů.
+- Planner: výpis plánů skupiny, bucketů a tasků plánu, načtení, vytvoření, úprava
+  a smazání tasku. Úprava a smazání používají ETag (`If-Match`). Když hlavička chybí,
+  služba si aktuální ETag načte sama.
 - OneDrive: výpis souborů v rootu a upload malých souborů.
 - Groups a Teams: výpis skupin a výpis kanálů týmu.
+- Admin consent: sestavení consent URL pro administrátora klientského tenantu.
 
 ## API
 
@@ -191,14 +219,32 @@ GET  /users?top=25&search=jane
 GET  /users/{user_id}
 GET  /users/{user_id}/mail/messages?folder=Inbox&top=25
 POST /users/{user_id}/mail/send
+GET  /admin-consent/url?redirect_uri=...&state=...
 GET  /users/{user_id}/calendar/events?top=25
 POST /users/{user_id}/calendar/events
+GET  /users/{user_id}/calendar/view?start=...&end=...&top=25&time_zone=Europe/Prague
+POST /users/{user_id}/calendar/schedule
+GET  /users/{user_id}/calendar/events/{event_id}
+PATCH  /users/{user_id}/calendar/events/{event_id}
+DELETE /users/{user_id}/calendar/events/{event_id}
 GET  /users/{user_id}/drive/root/children?top=25
 PUT  /users/{user_id}/drive/root/{path}
 GET  /groups?top=25
+GET  /groups/{group_id}/planner/plans
 GET  /teams/{team_id}/channels
+GET  /planner/plans/{plan_id}/buckets
+GET  /planner/plans/{plan_id}/tasks
+POST /planner/tasks
+GET  /planner/tasks/{task_id}
+PATCH  /planner/tasks/{task_id}     (volitelně hlavička If-Match)
+DELETE /planner/tasks/{task_id}     (volitelně hlavička If-Match)
 ```
 
+Parametry `start` a `end` u calendarView jsou ISO 8601 s offsetem, například
+`2026-09-08T08:00:00+02:00`. Datumy u Planneru (`due_date_time`, `start_date_time`)
+jsou ISO 8601 s offsetem, například `2026-09-10T16:00:00Z`. Řešitelé se předávají
+jako Graph user id v `assign_user_ids`, odebírají v `unassign_user_ids`.
+
 `user_id` může být Microsoft Graph user id nebo user principal name, například `jane@example.com`.
 
 ## Požadovaná Graph oprávnění
@@ -208,10 +254,22 @@ Přidělte pouze oprávnění, která dané nasazení skutečně používá:
 - Users: `User.Read.All`
 - Čtení mailů: `Mail.Read`
 - Odesílání mailů: `Mail.Send`
-- Čtení a zápis do kalendáře: `Calendars.ReadWrite`
+- Čtení a zápis do kalendáře, calendarView, getSchedule: `Calendars.ReadWrite`
+- Planner: `Tasks.ReadWrite.All` (zahrnuje i čtení, `Tasks.Read.All` netřeba)
 - Čtení a zápis do OneDrive: `Files.ReadWrite.All`
 - Výpis skupin a Teams kanálů: `Group.Read.All`, `Team.ReadBasic.All`, `Channel.ReadBasic.All`
 
+Pro konektor CSBOT (Calendar + Planner) je minimum `Calendars.ReadWrite` a `Tasks.ReadWrite.All`,
+obě jako Application permissions. `Calendars.ReadWrite` platí na všechny mailboxy tenantu,
+omezení na konkrétní mailbox se řeší na straně klienta v Exchange Online
+(application access policy), ne v této službě.
+
+## Ukázky pro klienty
+
+- `examples/csharp/ListUsersTop10`: konzolová aplikace .NET 8, volá `GET /users?top=10`
+  a obsahuje třídu `CredentialEncoder` pro šifrování hlaviček `X-MS365-*`.
+  Popis v `examples/csharp/README.md`.
+
 ## Lokální spuštění
 
 ```bash
@@ -223,3 +281,11 @@ Vygenerované OpenAPI UI otevřete na `http://localhost:8000/docs`.
 # job queue test Thu May 28 02:12:07 PM CEST 2026
 # job queue test Thu May 28 02:12:28 PM CEST 2026
 # websocket logs test Fri May 29 11:03:58 AM CEST 2026
+
+## Záznam změn
+
+- 2026-09-09: verze 1.1.0. Podle Notion zadání "MS365 práva konektoru" doplněn Calendar
+  (calendarView, getSchedule, get/patch/delete události), Planner (plány, buckety, tasky,
+  create/patch/delete s ETag) a `GET /admin-consent/url`. Kód ověřen jen importem aplikace
+  a serializací schémat, proti reálnému tenantu netestováno (chybí DEV App Registration).
+- 2026-09-09: přidána C# ukázka `examples/csharp/ListUsersTop10` (top 10 z `/users`).
diff --git a/app.yml b/app.yml
index 3eb5c7a..4734042 100644
--- a/app.yml
+++ b/app.yml
@@ -1,7 +1,7 @@
 id: microsoft-365-service
 name: Microsoft 365 Service
 language: python
-version: 1.0.1
+version: 1.1.0
 base_path: /apps/microsoft-365-service
 port: 8000
 status: development
diff --git a/app/config.py b/app/config.py
index 59032e5..fc6c2cd 100644
--- a/app/config.py
+++ b/app/config.py
@@ -5,7 +5,7 @@ from dataclasses import dataclass, replace
 @dataclass(frozen=True)
 class Settings:
     app_name: str = os.getenv("APP_NAME", "Microsoft 365 Service")
-    app_version: str = os.getenv("APP_VERSION", "1.0.1")
+    app_version: str = os.getenv("APP_VERSION", "1.1.0")
     root_path: str = os.getenv("ROOT_PATH", "")
     tenant_id: str = os.getenv("MS365_TENANT_ID", "")
     client_id: str = os.getenv("MS365_CLIENT_ID", "")
diff --git a/app/routes.py b/app/routes.py
index 133ab72..d87205d 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -1,12 +1,21 @@
 from typing import Any
+from urllib.parse import urlencode
 
-from fastapi import APIRouter, Body, Depends, Query, Response, status
+from fastapi import APIRouter, Body, Depends, Header, HTTPException, Query, Response, status
 
 from .config import Settings
 from .credentials import get_request_settings
 from .graph_client import MicrosoftGraphClient
-from .schemas import CalendarEventRequest, DriveUploadRequest, SendMailRequest
-from .services import CalendarService, DriveService, GroupsService, MailService, UsersService
+from .schemas import (
+    CalendarEventRequest,
+    CalendarEventUpdateRequest,
+    DriveUploadRequest,
+    PlannerTaskCreateRequest,
+    PlannerTaskUpdateRequest,
+    ScheduleRequest,
+    SendMailRequest,
+)
+from .services import CalendarService, DriveService, GroupsService, MailService, PlannerService, UsersService
 
 router = APIRouter(tags=["microsoft365"])
 
@@ -35,6 +44,10 @@ def get_groups_service(graph: MicrosoftGraphClient = Depends(get_graph_client))
     return GroupsService(graph)
 
 
+def get_planner_service(graph: MicrosoftGraphClient = Depends(get_graph_client)) -> PlannerService:
+    return PlannerService(graph)
+
+
 @router.get("/status")
 def microsoft365_status(request_settings: Settings = Depends(get_request_settings)) -> dict[str, Any]:
     return {
@@ -46,6 +59,31 @@ def microsoft365_status(request_settings: Settings = Depends(get_request_setting
     }
 
 
+@router.get("/admin-consent/url")
+def admin_consent_url(
+    redirect_uri: str = Query(..., description="HTTPS callback URL registered on the Entra app registration."),
+    state: str | None = Query(None, description="Opaque value returned to the callback, e.g. customer id."),
+    request_settings: Settings = Depends(get_request_settings),
+) -> dict[str, Any]:
+    """Build the admin consent URL a client tenant administrator must open to approve the multitenant app."""
+    if not request_settings.tenant_id or not request_settings.client_id:
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail="Tenant id and client id are required to build the admin consent URL.",
+        )
+    query: dict[str, str] = {
+        "client_id": request_settings.client_id,
+        "scope": request_settings.graph_scope,
+        "redirect_uri": redirect_uri,
+    }
+    if state:
+        query["state"] = state
+    return {
+        "tenant_id": request_settings.tenant_id,
+        "url": f"https://login.microsoftonline.com/{request_settings.tenant_id}/v2.0/adminconsent?{urlencode(query)}",
+    }
+
+
 @router.get("/users")
 async def list_users(
     top: int = Query(25, ge=1, le=999),
@@ -99,6 +137,56 @@ async def create_event(
     return await service.create_event(user_id=user_id, request=request)
 
 
+@router.get("/users/{user_id}/calendar/view")
+async def list_calendar_view(
+    user_id: str,
+    start: str = Query(..., description="ISO 8601 with offset, e.g. 2026-09-08T08:00:00+02:00."),
+    end: str = Query(..., description="ISO 8601 with offset, e.g. 2026-09-08T18:00:00+02:00."),
+    top: int = Query(25, ge=1, le=100),
+    time_zone: str | None = Query(None, description="Time zone for returned dates, e.g. Europe/Prague."),
+    service: CalendarService = Depends(get_calendar_service),
+) -> Any:
+    return await service.list_calendar_view(user_id=user_id, start=start, end=end, top=top, time_zone=time_zone)
+
+
+@router.post("/users/{user_id}/calendar/schedule")
+async def get_schedule(
+    user_id: str,
+    request: ScheduleRequest,
+    service: CalendarService = Depends(get_calendar_service),
+) -> Any:
+    return await service.get_schedule(user_id=user_id, request=request)
+
+
+@router.get("/users/{user_id}/calendar/events/{event_id}")
+async def get_event(
+    user_id: str,
+    event_id: str,
+    service: CalendarService = Depends(get_calendar_service),
+) -> Any:
+    return await service.get_event(user_id=user_id, event_id=event_id)
+
+
+@router.patch("/users/{user_id}/calendar/events/{event_id}")
+async def update_event(
+    user_id: str,
+    event_id: str,
+    request: CalendarEventUpdateRequest,
+    service: CalendarService = Depends(get_calendar_service),
+) -> Any:
+    return await service.update_event(user_id=user_id, event_id=event_id, request=request)
+
+
+@router.delete("/users/{user_id}/calendar/events/{event_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_event(
+    user_id: str,
+    event_id: str,
+    service: CalendarService = Depends(get_calendar_service),
+) -> Response:
+    await service.delete_event(user_id=user_id, event_id=event_id)
+    return Response(status_code=status.HTTP_204_NO_CONTENT)
+
+
 @router.get("/users/{user_id}/drive/root/children")
 async def list_drive_root_children(
     user_id: str,
@@ -129,3 +217,59 @@ async def list_groups(
 @router.get("/teams/{team_id}/channels")
 async def list_team_channels(team_id: str, service: GroupsService = Depends(get_groups_service)) -> Any:
     return await service.list_team_channels(team_id=team_id)
+
+
+@router.get("/groups/{group_id}/planner/plans")
+async def list_group_plans(group_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
+    return await service.list_group_plans(group_id=group_id)
+
+
+@router.get("/planner/plans/{plan_id}/buckets")
+async def list_plan_buckets(plan_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
+    return await service.list_plan_buckets(plan_id=plan_id)
+
+
+@router.get("/planner/plans/{plan_id}/tasks")
+async def list_plan_tasks(plan_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
+    return await service.list_plan_tasks(plan_id=plan_id)
+
+
+@router.post("/planner/tasks", status_code=status.HTTP_201_CREATED)
+async def create_planner_task(
+    request: PlannerTaskCreateRequest,
+    service: PlannerService = Depends(get_planner_service),
+) -> Any:
+    return await service.create_task(request=request)
+
+
+@router.get("/planner/tasks/{task_id}")
+async def get_planner_task(task_id: str, service: PlannerService = Depends(get_planner_service)) -> Any:
+    return await service.get_task(task_id=task_id)
+
+
+@router.patch("/planner/tasks/{task_id}")
+async def update_planner_task(
+    task_id: str,
+    request: PlannerTaskUpdateRequest,
+    if_match: str | None = Header(
+        None,
+        alias="If-Match",
+        description="Task ETag (@odata.etag). When omitted, the service loads the current ETag first.",
+    ),
+    service: PlannerService = Depends(get_planner_service),
+) -> Any:
+    return await service.update_task(task_id=task_id, request=request, if_match=if_match)
+
+
+@router.delete("/planner/tasks/{task_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_planner_task(
+    task_id: str,
+    if_match: str | None = Header(
+        None,
+        alias="If-Match",
+        description="Task ETag (@odata.etag). When omitted, the service loads the current ETag first.",
+    ),
+    service: PlannerService = Depends(get_planner_service),
+) -> Response:
+    await service.delete_task(task_id=task_id, if_match=if_match)
+    return Response(status_code=status.HTTP_204_NO_CONTENT)
diff --git a/app/schemas.py b/app/schemas.py
index 613ed8f..6382179 100644
--- a/app/schemas.py
+++ b/app/schemas.py
@@ -69,6 +69,125 @@ class CalendarEventRequest(BaseModel):
     online_meeting_provider: str | None = Field(None, pattern="^(teamsForBusiness|skypeForBusiness|skypeForConsumer)$")
 
 
+class CalendarEventUpdateRequest(BaseModel):
+    """Partial update; only fields that are set are sent to Microsoft Graph."""
+
+    subject: str | None = None
+    body: str | None = None
+    body_content_type: str = Field("HTML", pattern="^(HTML|Text)$")
+    start: DateTimeTimeZone | None = None
+    end: DateTimeTimeZone | None = None
+    location: str | None = None
+    attendees: list[CalendarAttendee] | None = None
+    is_online_meeting: bool | None = None
+    online_meeting_provider: str | None = Field(None, pattern="^(teamsForBusiness|skypeForBusiness|skypeForConsumer)$")
+
+    def as_graph_patch(self) -> dict[str, Any]:
+        payload: dict[str, Any] = {}
+        if self.subject is not None:
+            payload["subject"] = self.subject
+        if self.body is not None:
+            payload["body"] = {"contentType": self.body_content_type, "content": self.body}
+        if self.start is not None:
+            payload["start"] = self.start.model_dump(by_alias=True)
+        if self.end is not None:
+            payload["end"] = self.end.model_dump(by_alias=True)
+        if self.location is not None:
+            payload["location"] = {"displayName": self.location}
+        if self.attendees is not None:
+            payload["attendees"] = [attendee.as_graph_attendee() for attendee in self.attendees]
+        if self.is_online_meeting is not None:
+            payload["isOnlineMeeting"] = self.is_online_meeting
+        if self.online_meeting_provider is not None:
+            payload["onlineMeetingProvider"] = self.online_meeting_provider
+        return payload
+
+
+class ScheduleRequest(BaseModel):
+    """Free/busy lookup (Graph getSchedule) for one or more mailboxes."""
+
+    schedules: list[EmailStr] = Field(..., min_length=1, description="Mailboxes whose availability is requested.")
+    start: DateTimeTimeZone
+    end: DateTimeTimeZone
+    availability_view_interval: int = Field(30, ge=5, le=1440, description="Slot length in minutes.")
+
+    def as_graph_payload(self) -> dict[str, Any]:
+        return {
+            "schedules": [str(address) for address in self.schedules],
+            "startTime": self.start.model_dump(by_alias=True),
+            "endTime": self.end.model_dump(by_alias=True),
+            "availabilityViewInterval": self.availability_view_interval,
+        }
+
+
+def _planner_assignments(assign_user_ids: list[str], unassign_user_ids: list[str]) -> dict[str, Any]:
+    assignments: dict[str, Any] = {
+        user_id: {"@odata.type": "#microsoft.graph.plannerAssignment", "orderHint": " !"}
+        for user_id in assign_user_ids
+    }
+    for user_id in unassign_user_ids:
+        assignments[user_id] = None
+    return assignments
+
+
+class PlannerTaskCreateRequest(BaseModel):
+    plan_id: str
+    bucket_id: str | None = None
+    title: str
+    start_date_time: str | None = Field(None, description="ISO 8601 with offset, e.g. 2026-09-08T08:00:00Z.")
+    due_date_time: str | None = Field(None, description="ISO 8601 with offset, e.g. 2026-09-10T16:00:00Z.")
+    percent_complete: int | None = Field(None, ge=0, le=100)
+    priority: int | None = Field(None, ge=0, le=10, description="Graph priority: 1 urgent, 3 important, 5 medium, 9 low.")
+    assign_user_ids: list[str] = Field(default_factory=list, description="Microsoft Graph user ids to assign.")
+
+    def as_graph_payload(self) -> dict[str, Any]:
+        payload: dict[str, Any] = {"planId": self.plan_id, "title": self.title}
+        if self.bucket_id:
+            payload["bucketId"] = self.bucket_id
+        if self.start_date_time:
+            payload["startDateTime"] = self.start_date_time
+        if self.due_date_time:
+            payload["dueDateTime"] = self.due_date_time
+        if self.percent_complete is not None:
+            payload["percentComplete"] = self.percent_complete
+        if self.priority is not None:
+            payload["priority"] = self.priority
+        if self.assign_user_ids:
+            payload["assignments"] = _planner_assignments(self.assign_user_ids, [])
+        return payload
+
+
+class PlannerTaskUpdateRequest(BaseModel):
+    """Partial update; only fields that are set are sent to Microsoft Graph."""
+
+    title: str | None = None
+    bucket_id: str | None = None
+    start_date_time: str | None = None
+    due_date_time: str | None = None
+    percent_complete: int | None = Field(None, ge=0, le=100)
+    priority: int | None = Field(None, ge=0, le=10)
+    assign_user_ids: list[str] = Field(default_factory=list)
+    unassign_user_ids: list[str] = Field(default_factory=list)
+
+    def as_graph_patch(self) -> dict[str, Any]:
+        payload: dict[str, Any] = {}
+        if self.title is not None:
+            payload["title"] = self.title
+        if self.bucket_id is not None:
+            payload["bucketId"] = self.bucket_id
+        if self.start_date_time is not None:
+            payload["startDateTime"] = self.start_date_time
+        if self.due_date_time is not None:
+            payload["dueDateTime"] = self.due_date_time
+        if self.percent_complete is not None:
+            payload["percentComplete"] = self.percent_complete
+        if self.priority is not None:
+            payload["priority"] = self.priority
+        if self.assign_user_ids or self.unassign_user_ids:
+            payload["assignments"] = _planner_assignments(self.assign_user_ids, self.unassign_user_ids)
+        return payload
+
+
 class DriveUploadRequest(BaseModel):
     content_base64: str
     content_type: str = "application/octet-stream"
diff --git a/app/services.py b/app/services.py
index d140206..4d922e4 100644
--- a/app/services.py
+++ b/app/services.py
@@ -6,7 +6,15 @@ from urllib.parse import quote
 from fastapi import HTTPException, status
 
 from .graph_client import MicrosoftGraphClient
-from .schemas import CalendarEventRequest, DriveUploadRequest, SendMailRequest
+from .schemas import (
+    CalendarEventRequest,
+    CalendarEventUpdateRequest,
+    DriveUploadRequest,
+    PlannerTaskCreateRequest,
+    PlannerTaskUpdateRequest,
+    ScheduleRequest,
+    SendMailRequest,
+)
 
 
 def graph_segment(value: str) -> str:
@@ -74,6 +82,11 @@ class MailService:
         )
 
 
+CALENDAR_EVENT_SELECT = (
+    "id,subject,start,end,location,attendees,webLink,isOnlineMeeting,onlineMeeting,showAs,isCancelled,organizer"
+)
+
+
 class CalendarService:
     def __init__(self, graph: MicrosoftGraphClient) -> None:
         self._graph = graph
@@ -82,10 +95,66 @@ class CalendarService:
         params = {
             "$top": top,
             "$orderby": "start/dateTime",
-            "$select": "id,subject,start,end,location,attendees,webLink,isOnlineMeeting,onlineMeeting",
+            "$select": CALENDAR_EVENT_SELECT,
         }
         return await self._graph.request("GET", f"/users/{graph_segment(user_id)}/events", params=params)
 
+    async def list_calendar_view(
+        self,
+        user_id: str,
+        start: str,
+        end: str,
+        top: int = 25,
+        time_zone: str | None = None,
+    ) -> Any:
+        params = {
+            "startDateTime": start,
+            "endDateTime": end,
+            "$top": top,
+            "$orderby": "start/dateTime",
+            "$select": CALENDAR_EVENT_SELECT,
+        }
+        headers = {"Prefer": f'outlook.timezone="{time_zone}"'} if time_zone else None
+        return await self._graph.request(
+            "GET",
+            f"/users/{graph_segment(user_id)}/calendarView",
+            params=params,
+            headers=headers,
+        )
+
+    async def get_schedule(self, user_id: str, request: ScheduleRequest) -> Any:
+        return await self._graph.request(
+            "POST",
+            f"/users/{graph_segment(user_id)}/calendar/getSchedule",
+            json=request.as_graph_payload(),
+        )
+
+    async def get_event(self, user_id: str, event_id: str) -> Any:
+        return await self._graph.request(
+            "GET",
+            f"/users/{graph_segment(user_id)}/events/{graph_segment(event_id)}",
+            params={"$select": CALENDAR_EVENT_SELECT + ",body"},
+        )
+
+    async def update_event(self, user_id: str, event_id: str, request: CalendarEventUpdateRequest) -> Any:
+        payload = request.as_graph_patch()
+        if not payload:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Calendar event update must contain at least one field.",
+            )
+        return await self._graph.request(
+            "PATCH",
+            f"/users/{graph_segment(user_id)}/events/{graph_segment(event_id)}",
+            json=payload,
+        )
+
+    async def delete_event(self, user_id: str, event_id: str) -> None:
+        await self._graph.request(
+            "DELETE",
+            f"/users/{graph_segment(user_id)}/events/{graph_segment(event_id)}",
+        )
+
     async def create_event(self, user_id: str, request: CalendarEventRequest) -> Any:
         payload: dict[str, Any] = {
             "subject": request.subject,
@@ -103,6 +172,63 @@ class CalendarService:
         return await self._graph.request("POST", f"/users/{graph_segment(user_id)}/events", json=payload)
 
 
+class PlannerService:
+    """Microsoft Planner. Updates and deletes require the task ETag (Graph optimistic concurrency)."""
+
+    def __init__(self, graph: MicrosoftGraphClient) -> None:
+        self._graph = graph
+
+    async def list_group_plans(self, group_id: str) -> Any:
+        return await self._graph.request("GET", f"/groups/{graph_segment(group_id)}/planner/plans")
+
+    async def list_plan_buckets(self, plan_id: str) -> Any:
+        return await self._graph.request("GET", f"/planner/plans/{graph_segment(plan_id)}/buckets")
+
+    async def list_plan_tasks(self, plan_id: str) -> Any:
+        return await self._graph.request("GET", f"/planner/plans/{graph_segment(plan_id)}/tasks")
+
+    async def get_task(self, task_id: str) -> Any:
+        return await self._graph.request("GET", f"/planner/tasks/{graph_segment(task_id)}")
+
+    async def create_task(self, request: PlannerTaskCreateRequest) -> Any:
+        return await self._graph.request("POST", "/planner/tasks", json=request.as_graph_payload())
+
+    async def update_task(self, task_id: str, request: PlannerTaskUpdateRequest, if_match: str | None) -> Any:
+        payload = request.as_graph_patch()
+        if not payload:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Planner task update must contain at least one field.",
+            )
+        etag = await self._resolve_etag(task_id, if_match)
+        return await self._graph.request(
+            "PATCH",
+            f"/planner/tasks/{graph_segment(task_id)}",
+            json=payload,
+            headers={"If-Match": etag, "Prefer": "return=representation"},
+        )
+
+    async def delete_task(self, task_id: str, if_match: str | None) -> None:
+        etag = await self._resolve_etag(task_id, if_match)
+        await self._graph.request(
+            "DELETE",
+            f"/planner/tasks/{graph_segment(task_id)}",
+            headers={"If-Match": etag},
+        )
+
+    async def _resolve_etag(self, task_id: str, if_match: str | None) -> str:
+        if if_match:
+            return if_match
+        task = await self.get_task(task_id)
+        etag = task.get("@odata.etag") if isinstance(task, dict) else None
+        if not etag:
+            raise HTTPException(
+                status_code=status.HTTP_502_BAD_GATEWAY,
+                detail={"message": "Microsoft Graph did not return an ETag for the Planner task.", "task_id": task_id},
+            )
+        return etag
+
+
 class DriveService:
     def __init__(self, graph: MicrosoftGraphClient) -> None:
         self._graph = graph
diff --git a/examples/csharp/ListUsersTop10/ListUsersTop10.csproj b/examples/csharp/ListUsersTop10/ListUsersTop10.csproj
new file mode 100644
index 0000000..f704bf4
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/ListUsersTop10.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>
diff --git a/examples/csharp/ListUsersTop10/Program.cs b/examples/csharp/ListUsersTop10/Program.cs
new file mode 100644
index 0000000..db67014
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/Program.cs
@@ -0,0 +1,128 @@
+// Ukazka volani microsoft-365-service: vypis prvnich 10 uzivatelu z GET /users.
+//
+// Sluzba: https://services.csbot.cz/apps/microsoft-365-service
+// Dokumentace (Swagger): https://services.csbot.cz/apps/microsoft-365-service/docs
+//
+// Credentials se posilaji v hlavickach X-MS365-*. Kazda hodnota je zasifrovana
+// AES-256-GCM klicem odvozenym pres HKDF-SHA256 ze sdileneho secretu
+// (MS365_CREDENTIAL_ENCODING_SECRET na strane sluzby). Format hodnoty:
+//   v1.<base64url nonce>.<base64url ciphertext+tag>
+//
+// Spusteni:
+//   set MS365_SERVICE_BASE_URL=https://services.csbot.cz/apps/microsoft-365-service
+//   set MS365_TENANT_ID=<tenant id>
+//   set MS365_CLIENT_ID=<client id>
+//   set MS365_CLIENT_SECRET=<client secret>
+//   set MS365_CREDENTIAL_ENCODING_SECRET=<sdileny secret>
+//   dotnet run
+
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+var baseUrl = Env("MS365_SERVICE_BASE_URL", "https://services.csbot.cz/apps/microsoft-365-service");
+var tenantId = Env("MS365_TENANT_ID");
+var clientId = Env("MS365_CLIENT_ID");
+var clientSecret = Env("MS365_CLIENT_SECRET");
+var sharedSecret = Env("MS365_CREDENTIAL_ENCODING_SECRET");
+
+const int top = 10;
+
+using var http = new HttpClient { BaseAddress = new Uri(baseUrl.TrimEnd('/') + "/") };
+http.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+
+using var request = new HttpRequestMessage(HttpMethod.Get, $"users?top={top}");
+request.Headers.Add("X-MS365-Tenant-Id", CredentialEncoder.Encode(tenantId, "X-MS365-Tenant-Id", sharedSecret));
+request.Headers.Add("X-MS365-Client-Id", CredentialEncoder.Encode(clientId, "X-MS365-Client-Id", sharedSecret));
+request.Headers.Add("X-MS365-Client-Secret", CredentialEncoder.Encode(clientSecret, "X-MS365-Client-Secret", sharedSecret));
+request.Headers.Add("X-MS365-Credential-Version", "v1");
+
+using var response = await http.SendAsync(request);
+var body = await response.Content.ReadAsStringAsync();
+
+if (!response.IsSuccessStatusCode)
+{
+    // 400 = spatne/prosle hlavicky, 502 = chyba z Microsoft Graph (detail je v tele),
+    // 403 text/plain = request neprosel pres reverzni proxy (IP allowlist pro GET).
+    Console.Error.WriteLine($"HTTP {(int)response.StatusCode} {response.ReasonPhrase}");
+    Console.Error.WriteLine(body);
+    return 1;
+}
+
+// Sluzba vraci odpoved Microsoft Graph beze zmeny: { "value": [ { ...user... } ], "@odata.nextLink": "..." }
+using var json = JsonDocument.Parse(body);
+var users = json.RootElement.GetProperty("value");
+
+Console.WriteLine($"Nacteno uzivatelu: {users.GetArrayLength()}");
+foreach (var user in users.EnumerateArray())
+{
+    var displayName = user.TryGetProperty("displayName", out var dn) ? dn.GetString() : null;
+    var upn = user.TryGetProperty("userPrincipalName", out var up) ? up.GetString() : null;
+    var mail = user.TryGetProperty("mail", out var m) && m.ValueKind == JsonValueKind.String ? m.GetString() : null;
+    var id = user.GetProperty("id").GetString();
+
+    Console.WriteLine($"{displayName} | {upn} | {mail ?? "-"} | {id}");
+}
+
+return 0;
+
+static string Env(string name, string? fallback = null)
+{
+    var value = Environment.GetEnvironmentVariable(name);
+    if (!string.IsNullOrWhiteSpace(value))
+    {
+        return value;
+    }
+    if (fallback is not null)
+    {
+        return fallback;
+    }
+    throw new InvalidOperationException($"Chybi environment promenna {name}.");
+}
+
+/// <summary>
+/// Sifrovani hodnot pro hlavicky X-MS365-*. Musi presne odpovidat dekodovani na strane sluzby
+/// (app/credentials.py): HKDF-SHA256 se salt "microsoft-365-service.credentials.v1"
+/// a info = nazev hlavicky, AES-256-GCM s 12B nonce, 16B tagem a AAD = nazev hlavicky.
+/// </summary>
+static class CredentialEncoder
+{
+    private static readonly byte[] HkdfSalt = Encoding.UTF8.GetBytes("microsoft-365-service.credentials.v1");
+
+    public static string Encode(string value, string headerName, string sharedSecret, TimeSpan? validity = null)
+    {
+        var now = DateTimeOffset.UtcNow;
+        var payload = JsonSerializer.Serialize(new
+        {
+            value,
+            issued_at = now.ToString("O"),
+            expires_at = now.Add(validity ?? TimeSpan.FromHours(1)).ToString("O"),
+        });
+
+        var headerBytes = Encoding.UTF8.GetBytes(headerName);
+        var key = HKDF.DeriveKey(
+            HashAlgorithmName.SHA256,
+            Encoding.UTF8.GetBytes(sharedSecret),
+            outputLength: 32,
+            salt: HkdfSalt,
+            info: headerBytes);
+
+        var nonce = RandomNumberGenerator.GetBytes(12);
+        var plaintext = Encoding.UTF8.GetBytes(payload);
+        var ciphertext = new byte[plaintext.Length];
+        var tag = new byte[16];
+
+        using var aes = new AesGcm(key, tagSizeInBytes: 16);
+        aes.Encrypt(nonce, plaintext, ciphertext, tag, associatedData: headerBytes);
+
+        var ciphertextAndTag = new byte[ciphertext.Length + tag.Length];
+        ciphertext.CopyTo(ciphertextAndTag, 0);
+        tag.CopyTo(ciphertextAndTag, ciphertext.Length);
+
+        return $"v1.{Base64Url(nonce)}.{Base64Url(ciphertextAndTag)}";
+    }
+
+    private static string Base64Url(byte[] data) =>
+        Convert.ToBase64String(data).TrimEnd('=').Replace('+', '-').Replace('/', '_');
+}
diff --git a/examples/csharp/ListUsersTop10/obj/Debug/net8.0/.NETCoreApp,Version=v8.0.AssemblyAttributes.cs b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/.NETCoreApp,Version=v8.0.AssemblyAttributes.cs
new file mode 100644
index 0000000..2217181
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/.NETCoreApp,Version=v8.0.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v8.0", FrameworkDisplayName = ".NET 8.0")]
diff --git a/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.AssemblyInfo.cs b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.AssemblyInfo.cs
new file mode 100644
index 0000000..b3bf715
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.AssemblyInfo.cs
@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("ListUsersTop10")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+275bd6c46764ec8db008fa2fa8c30673bb96f3d8")]
+[assembly: System.Reflection.AssemblyProductAttribute("ListUsersTop10")]
+[assembly: System.Reflection.AssemblyTitleAttribute("ListUsersTop10")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+
diff --git a/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.AssemblyInfoInputs.cache b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.AssemblyInfoInputs.cache
new file mode 100644
index 0000000..48ca0b9
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+502171e0ece4b0be631032bff07cea1c6b79151ad77b399268a548f2c009e1d0
diff --git a/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.GeneratedMSBuildEditorConfig.editorconfig b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.GeneratedMSBuildEditorConfig.editorconfig
new file mode 100644
index 0000000..7dd5c4e
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.GeneratedMSBuildEditorConfig.editorconfig
@@ -0,0 +1,18 @@
+is_global = true
+build_property.TargetFramework = net8.0
+build_property.TargetFrameworkIdentifier = .NETCoreApp
+build_property.TargetFrameworkVersion = v8.0
+build_property.TargetPlatformMinVersion = 
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property.EntryPointFilePath = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = ListUsersTop10
+build_property.ProjectDir = D:\GitHubRepository\Hracicky\x\ms365\microsoft-365-service\examples\csharp\ListUsersTop10\
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.EffectiveAnalysisLevelStyle = 8.0
+build_property.EnableCodeStyleSeverity = 
diff --git a/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.GlobalUsings.g.cs b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.GlobalUsings.g.cs
new file mode 100644
index 0000000..d12bcbc
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.GlobalUsings.g.cs
@@ -0,0 +1,8 @@
+// <auto-generated/>
+global using System;
+global using System.Collections.Generic;
+global using System.IO;
+global using System.Linq;
+global using System.Net.Http;
+global using System.Threading;
+global using System.Threading.Tasks;
diff --git a/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.assets.cache b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.assets.cache
new file mode 100644
index 0000000..297ea05
Binary files /dev/null and b/examples/csharp/ListUsersTop10/obj/Debug/net8.0/ListUsersTop10.assets.cache differ
diff --git a/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.dgspec.json b/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.dgspec.json
new file mode 100644
index 0000000..80ce806
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.dgspec.json
@@ -0,0 +1,77 @@
+{
+  "format": 1,
+  "restore": {
+    "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj": {}
+  },
+  "projects": {
+    "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj": {
+      "version": "1.0.0",
+      "restore": {
+        "projectUniqueName": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj",
+        "projectName": "ListUsersTop10",
+        "projectPath": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj",
+        "packagesPath": "C:\\Users\\GamingPC\\.nuget\\packages\\",
+        "outputPath": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\obj\\",
+        "projectStyle": "PackageReference",
+        "fallbackFolders": [
+          "C:\\Program Files (x86)\\Microsoft Visual Studio\\Shared\\NuGetPackages"
+        ],
+        "configFilePaths": [
+          "C:\\Users\\GamingPC\\AppData\\Roaming\\NuGet\\NuGet.Config",
+          "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.FallbackLocation.config",
+          "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config"
+        ],
+        "originalTargetFrameworks": [
+          "net8.0"
+        ],
+        "sources": {
+          "C:\\Program Files (x86)\\Microsoft SDKs\\NuGetPackages\\": {},
+          "C:\\Program Files\\dotnet\\library-packs": {},
+          "D:\\CustomNuGetPackages": {},
+          "https://api.nuget.org/v3/index.json": {}
+        },
+        "frameworks": {
+          "net8.0": {
+            "framework": "net8.0",
+            "targetAlias": "net8.0",
+            "projectReferences": {}
+          }
+        },
+        "warningProperties": {
+          "warnAsError": [
+            "NU1605"
+          ]
+        },
+        "restoreAuditProperties": {
+          "enableAudit": "true",
+          "auditLevel": "low",
+          "auditMode": "direct"
+        },
+        "SdkAnalysisLevel": "10.0.400"
+      },
+      "frameworks": {
+        "net8.0": {
+          "framework": "net8.0",
+          "targetAlias": "net8.0",
+          "imports": [
+            "net461",
+            "net462",
+            "net47",
+            "net471",
+            "net472",
+            "net48",
+            "net481"
+          ],
+          "assetTargetFallback": true,
+          "warn": true,
+          "frameworkReferences": {
+            "Microsoft.NETCore.App": {
+              "privateAssets": "all"
+            }
+          },
+          "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\10.0.400/PortableRuntimeIdentifierGraph.json"
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.g.props b/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.g.props
new file mode 100644
index 0000000..31462d3
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.g.props
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
+    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
+    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
+    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\GamingPC\.nuget\packages\;C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages</NuGetPackageFolders>
+    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
+    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">7.0.0</NuGetToolVersion>
+  </PropertyGroup>
+  <ItemGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <SourceRoot Include="C:\Users\GamingPC\.nuget\packages\" />
+    <SourceRoot Include="C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages\" />
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.g.targets b/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.g.targets
new file mode 100644
index 0000000..3dc06ef
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/ListUsersTop10.csproj.nuget.g.targets
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" />
\ No newline at end of file
diff --git a/examples/csharp/ListUsersTop10/obj/project.assets.json b/examples/csharp/ListUsersTop10/obj/project.assets.json
new file mode 100644
index 0000000..8d2ed4e
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/project.assets.json
@@ -0,0 +1,83 @@
+{
+  "version": 4,
+  "targets": {
+    "net8.0": {}
+  },
+  "libraries": {},
+  "projectFileDependencyGroups": {
+    "net8.0": []
+  },
+  "packageFolders": {
+    "C:\\Users\\GamingPC\\.nuget\\packages\\": {},
+    "C:\\Program Files (x86)\\Microsoft Visual Studio\\Shared\\NuGetPackages": {}
+  },
+  "project": {
+    "version": "1.0.0",
+    "restore": {
+      "projectUniqueName": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj",
+      "projectName": "ListUsersTop10",
+      "projectPath": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj",
+      "packagesPath": "C:\\Users\\GamingPC\\.nuget\\packages\\",
+      "outputPath": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\obj\\",
+      "projectStyle": "PackageReference",
+      "fallbackFolders": [
+        "C:\\Program Files (x86)\\Microsoft Visual Studio\\Shared\\NuGetPackages"
+      ],
+      "configFilePaths": [
+        "C:\\Users\\GamingPC\\AppData\\Roaming\\NuGet\\NuGet.Config",
+        "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.FallbackLocation.config",
+        "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config"
+      ],
+      "originalTargetFrameworks": [
+        "net8.0"
+      ],
+      "sources": {
+        "C:\\Program Files (x86)\\Microsoft SDKs\\NuGetPackages\\": {},
+        "C:\\Program Files\\dotnet\\library-packs": {},
+        "D:\\CustomNuGetPackages": {},
+        "https://api.nuget.org/v3/index.json": {}
+      },
+      "frameworks": {
+        "net8.0": {
+          "framework": "net8.0",
+          "targetAlias": "net8.0",
+          "projectReferences": {}
+        }
+      },
+      "warningProperties": {
+        "warnAsError": [
+          "NU1605"
+        ]
+      },
+      "restoreAuditProperties": {
+        "enableAudit": "true",
+        "auditLevel": "low",
+        "auditMode": "direct"
+      },
+      "SdkAnalysisLevel": "10.0.400"
+    },
+    "frameworks": {
+      "net8.0": {
+        "framework": "net8.0",
+        "targetAlias": "net8.0",
+        "imports": [
+          "net461",
+          "net462",
+          "net47",
+          "net471",
+          "net472",
+          "net48",
+          "net481"
+        ],
+        "assetTargetFallback": true,
+        "warn": true,
+        "frameworkReferences": {
+          "Microsoft.NETCore.App": {
+            "privateAssets": "all"
+          }
+        },
+        "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\10.0.400/PortableRuntimeIdentifierGraph.json"
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/examples/csharp/ListUsersTop10/obj/project.nuget.cache b/examples/csharp/ListUsersTop10/obj/project.nuget.cache
new file mode 100644
index 0000000..0163ef1
--- /dev/null
+++ b/examples/csharp/ListUsersTop10/obj/project.nuget.cache
@@ -0,0 +1,8 @@
+{
+  "version": 2,
+  "dgSpecHash": "4FfrW7UlSBU=",
+  "success": true,
+  "projectFilePath": "D:\\GitHubRepository\\Hracicky\\x\\ms365\\microsoft-365-service\\examples\\csharp\\ListUsersTop10\\ListUsersTop10.csproj",
+  "expectedPackageFiles": [],
+  "logs": []
+}
\ No newline at end of file
diff --git a/examples/csharp/README.md b/examples/csharp/README.md
new file mode 100644
index 0000000..bce7c23
--- /dev/null
+++ b/examples/csharp/README.md
@@ -0,0 +1,36 @@
+# Ukazky volani sluzby v C#
+
+## ListUsersTop10
+
+Konzolova aplikace (.NET 8), ktera zavola `GET /users?top=10` a vypise
+displayName, userPrincipalName, mail a id kazdeho uzivatele.
+
+Obsahuje tridu `CredentialEncoder`, ktera sifruje hodnoty pro hlavicky
+`X-MS365-Tenant-Id`, `X-MS365-Client-Id` a `X-MS365-Client-Secret` presne tak,
+jak je sluzba dekoduje v `app/credentials.py`. Tridu lze zkopirovat do
+libovolneho projektu, nema zadne externi zavislosti.
+
+### Spusteni
+
+```powershell
+cd examples/csharp/ListUsersTop10
+$env:MS365_SERVICE_BASE_URL = "https://services.csbot.cz/apps/microsoft-365-service"
+$env:MS365_TENANT_ID = "<tenant id>"
+$env:MS365_CLIENT_ID = "<client id>"
+$env:MS365_CLIENT_SECRET = "<client secret>"
+$env:MS365_CREDENTIAL_ENCODING_SECRET = "<sdileny secret, stejny jako na serveru>"
+dotnet run
+```
+
+### Co ocekavat
+
+- `200` a JSON ve tvaru Microsoft Graph: `{ "value": [ ... ], "@odata.nextLink": "..." }`.
+- `400` kdyz hlavicky chybi, jsou neuplne, prosle nebo je spatny sdileny secret.
+- `502` kdyz Microsoft Graph nebo prihlaseni k Entra ID selze, detail je v tele odpovedi.
+- `503` kdyz sluzba nema nastaveny `MS365_CREDENTIAL_ENCODING_SECRET`.
+- `403 text/plain` kdyz GET neprojde pres reverzni proxy (IP allowlist), tj. problem
+  neni ve sluzbe, ale v sitovem pristupu klienta.
+
+Hlavicky lze vynechat jen tehdy, kdyz ma sluzba credentials nastavene
+v environment promennych na serveru. Instance na services.csbot.cz je nema
+(`GET /status` vraci `configured: false`), takze tam jsou hlavicky povinne.