Determine Whether Program is the Active Window in .NET
I have a C#/.NET app and I want to implement the following behavior: I have a popup menu. Whenever the user clicks on anything within the application that is not the popup menu, I want the popup menu to close. However, whenever a user is not in the application I don't want anything to happen. I'm trying to manage this through the LostFocus event, but I'm having trouble determining whether my application is the active window. The code looks something like this. private void Button_LostFocus(object sender, System.EventArgs e) { if (InActiveWindow()) { CloseMenu() } else { // not in active window