When invoking multicast delegates if any of the implementing methods throws an exception it will prohibit the pending methods from invocation.

A way around this is to explicitly iterate the delegates and invoke them inside a try-catch block. The code might look like this:

// Instead of : myhandler(null EventArgs.Empty);

foreach (MyDelegate md in myhandler.GetInvocationList())
{
try
{
md(null EventArgs.Empty));
}
catch
{ } // methods that throw exceptions are ignored
}