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 # Method OpenBuilderUIForComponentAsync

 Last update: 19.06.2026 

Namespace: [Phoenix.ComponentAPI](Phoenix.ComponentAPI.md)  
Assembly: Phoenix.ComponentAPI.dll

## OpenBuilderUIForComponentAsync(IHarnessRunnerSession)

Creates the builder UI to edit the given instantiated IHarnessSession. No IPaczWriter local session may be open on this runner when calling this method.

```csharp
Task<IHarnessBuilderUISession> OpenBuilderUIForComponentAsync(IHarnessRunnerSession session)


```

### Parameters

`session` [IHarnessRunnerSession](Phoenix.ComponentAPI.IHarnessRunnerSession.md)

The session to instantiate a builder UI for. The session must have been created by this client object. It is illegal to call this function more than once without calling Dispose on the returned IHarnessBuilderUISession first.

### Returns

[Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task-1)&lt;[IHarnessBuilderUISession](Phoenix.ComponentAPI.IHarnessBuilderUISession.md)&gt;

A task that returns a new IHarnessBuilderUISession.

### Exceptions

[InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception)

If a builder or local edit session is already open for the given runner session