# TransactionalState<TState>.PerformUpdate(Func<TState, TResult>)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.transactions/orleans.transactions.transactionalstate-1/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.transactions/orleans.transactions.transactionalstate-1/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Transactions/State/TransactionalState.cs#L113-L174)

```csharp
public Task<TResult> PerformUpdate<TResult>(Func<TState, TResult> updateAction)
```

Performs an update operation and returns the result.

### Parameters

- `updateAction` (`Func<TState, TResult>`): A function that can read and update the state, and return a result