Completes the asynchronous operation started in BeginResumeTransfer.
Before calling BeginResumeTransfer, you need to create a callback method that implements the AsyncCallback delegate. This callback method executes in a separate thread and is called by the system after BeginResumeTransfer returns. The callback method must accept the IAsyncResult returned by the BeginResumeTransfer method as a parameter. This parameter may then be passed to the EndResumeTransfer method to complete the operation.