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awesome-copilot/cookbook/copilot-sdk/dotnet/persisting-sessions.md
2026-01-29 14:29:36 +11:00

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# Session Persistence and Resumption
Save and restore conversation sessions across application restarts.
## Example scenario
You want users to be able to continue a conversation even after closing and reopening your application.
> **Runnable example:** [recipe/persisting-sessions.cs](recipe/persisting-sessions.cs)
>
> ```bash
> cd recipe
> dotnet run persisting-sessions.cs
> ```
### Creating a session with a custom ID
```csharp
using GitHub.Copilot.SDK;
await using var client = new CopilotClient();
await client.StartAsync();
// Create session with a memorable ID
var session = await client.CreateSessionAsync(new SessionConfig
{
SessionId = "user-123-conversation",
Model = "gpt-5"
});
await session.SendAsync(new MessageOptions { Prompt = "Let's discuss TypeScript generics" });
// Session ID is preserved
Console.WriteLine(session.SessionId); // "user-123-conversation"
// Destroy session but keep data on disk
await session.DisposeAsync();
await client.StopAsync();
```
### Resuming a session
```csharp
await using var client = new CopilotClient();
await client.StartAsync();
// Resume the previous session
var session = await client.ResumeSessionAsync("user-123-conversation");
// Previous context is restored
await session.SendAsync(new MessageOptions { Prompt = "What were we discussing?" });
await session.DisposeAsync();
await client.StopAsync();
```
### Listing available sessions
```csharp
var sessions = await client.ListSessionsAsync();
foreach (var s in sessions)
{
Console.WriteLine($"Session: {s.SessionId}");
}
```
### Deleting a session permanently
```csharp
// Remove session and all its data from disk
await client.DeleteSessionAsync("user-123-conversation");
```
### Getting session history
Retrieve all messages from a session:
```csharp
var messages = await session.GetMessagesAsync();
foreach (var msg in messages)
{
Console.WriteLine($"[{msg.Type}] {msg.Data.Content}");
}
```
## Best practices
1. **Use meaningful session IDs**: Include user ID or context in the session ID
2. **Handle missing sessions**: Check if a session exists before resuming
3. **Clean up old sessions**: Periodically delete sessions that are no longer needed