IAsyncResult<T> BeginRead<T>(
	T template,
	long timeout,
	AsyncCallback<T> userCallback,
	Object stateObject
)

Function BeginRead(Of T) ( _
	template As T, _
	timeout As Long, _
	userCallback As AsyncCallback(Of T), _
	stateObject As Object _
) As IAsyncResult(Of T)

generic<typename T>
IAsyncResult<T>^ BeginRead(
	T template, 
	long long timeout, 
	AsyncCallback<T>^ userCallback, 
	Object^ stateObject
)

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