You don't call events. Events are raised, which causes event handlers to be invoked. Which form creates the other? I'm guessing that form1 displays form2 and then you want to update form1 when something happens on form2. Is that correct? If so, what do you want to do on form1 and what is happening on form2. When I said we need a full and clear description I was suggesting that you provide that full and clear description.