# SessionStart.SessionStart(SiloAddress)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.diagnostics.activationrebalancerevents.sessionstart/) | [Constructors](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.diagnostics.activationrebalancerevents.sessionstart/constructors/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Diagnostics/ActivationRebalancerEvents.cs#L101)

```csharp
public SessionStart(SiloAddress siloAddress)
```

Event payload for when a rebalancing session starts.

### Parameters

- `siloAddress` (`SiloAddress`): The address of the silo hosting the rebalancer.