IAsyncResult<T> BeginExecute<T>(
	ISpaceTask<T> task,
	Object routing,
	AsyncCallback<T> userCallback,
	Object stateObject
)

Function BeginExecute(Of T) ( _
	task As ISpaceTask(Of T), _
	routing As Object, _
	userCallback As AsyncCallback(Of T), _
	stateObject As Object _
) As IAsyncResult(Of T)

generic<typename T>
IAsyncResult<T>^ BeginExecute(
	ISpaceTask<T>^ task, 
	Object^ routing, 
	AsyncCallback<T>^ userCallback, 
	Object^ stateObject
)

J# supports the use of generic APIs, but not the declaration of new ones.