# SessionStart

Package: [Microsoft.Orleans.Runtime](/orleans/docs/api/csharp/microsoft.orleans.runtime/) 10.0.0

[NuGet package](https://www.nuget.org/packages/Microsoft.Orleans.Runtime) | [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Diagnostics/ActivationRebalancerEvents.cs#L101)

```csharp
public sealed class SessionStart : RebalancerEvent
```

Event payload for when a rebalancing session starts.

## Constructors

- [SessionStart(SiloAddress)](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.diagnostics.activationrebalancerevents.sessionstart/constructors/constructor-orleans-runtime-siloaddress-d60cfeb5/)