Completes the asynchronous operation started in BeginRenameFile.
true if the directory was changed successfully.
Before calling BeginRenameFile, 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 BeginRenameFile returns. The callback method must accept the IAsyncResult returned by the BeginRenameFile method as a parameter. This parameter may then be passed to the EndRenameFile method to complete the operation.