C#

// This delegate is specific to our method; all the heavy work 
// will be done inside of it.
private delegate void DoWorkDelegate(WorkArgs e);
 
// The whole purpose of WorkArgs is to make the delegate cleaner; if 
// you only have a few args by all means use that :)
public void DoWork(WorkArgs e)
{
  DoWorkDelegate dwd = new DoWorkDelegate(DoWorkReal);
 
  IAsyncResult ar = dwd.BeginInvoke(e /* The args to the delegate */
                    null, null);
 
  // Wait until work is done; this uses 0 CPU time
  ar.AsyncWaitHandle.WaitOne(); 
  
  if( ar.IsCompleted ) // should always be true
  { 
    wdw.EndInvoke(ar);
    
    // Work is done
  }
}
 
// This is where you do the real heavy work
private void DoWorkReal(WorkArgs e) // Signature must match the delegate
{
  // Do the work here
}