Comments by tnd2000 (Top 7 by date)

Is this a program requirement or did you want to do it to debug some issues?
Exception can only be caught one time only. Outer exception will only catch if inner exception doesn't handle it, or if another exception occurs while it's being handled.
try
{
try
{
dosomething
}
catch
{
innerchach;
}
catch
{
this code will only execute if an exception is thrown in inner catch
}
}

Debugger break when exception is thrown works like a break point. It just breaks execution, it does not kill the error handling codes.

I didn't vote, but I think the OP wanted to know how Monitor works. Not how different threads can communicate via events or sockets.

That's what TryEnter(fork, locked) does. When lock is false, it means another thread has locked/entered.

Maybe what you wanted is for the thread to be blocked? If so, use Monitor.Enter instead.

If you found problems with the code, you should post it in the discussion. http://rosettacode.org/wiki/Talk:Dining_philosophers