void SourceQueue_Process(object sender, ProcessQueueEventArgs <Tuple <byte[], int, int> > e)
{
var ar = SourceStream.BeginWrite(e.Item.Item1, e.Item.Item2, e.Item.Item3, null, null);
using (ar.AsyncWaitHandle)
{
if (ar.AsyncWaitHandle.WaitOne(-1))
{
SourceStream.EndWrite(ar);
}
}
}