When the asyn method finishes processing, the AsyncCallback method is automatically called, where post processing stmts can be executed. With this technique there is no need to poll or wait for the asyn thread to complete.
This is some expln on Aynsc Call back usage:
Callback Model: The callback model requires that we specify a method to callback on and include any state that we need in the callback method to complete the call. The callback model can be seen in the following example:
static byte[] buffer = new byte[100];
static void TestCallbackAPM()
{
string filename = System.IO.Path.Combine (System.Environment.CurrentDirectory, "mfc71.pdb");
FileStream strm = new FileStream(filename,
FileMode.Open, FileAccess.Read, FileShare.Read, 1024,
FileOptions.Asynchronous);
// Make the asynchronous call
IAsyncResult result = strm.BeginRead(buffer, 0, buffer.Length,
new AsyncCallback(CompleteRead), strm);
}
