How to get access to the thread executing an asynchronous call?

Hi! Does anybody know how to abort a long-running asynchronous call from
the calling thread?
To do this, one needs a reference to the thread executing the call and
there seems to be no easy way to get this reference from the calling thread.

You can do the following but I don't like that much:

....
// calling thread
Thread asyncCallThread;
AsyncCallDlgt.BeginInvoke(ref asyncCallThread, AsyncCallDlgt);
while(asyncCallThread == null){};
....
asyncCallThread.Abort();

....
// called method
public void AsyncCall(ref asyncCallThread)
{
asyncCallThread = Thread.CurrentThread;
...
}

Anyway, is it safe to abort the async call thread?

Any ideas?