You can open the MSDN Library, navigate to the topic for the Math class, read the list of methods and copy the names of those you want to include into your ListBox. You seem to think that using code to dynamically read something from the Math class in order to populate the ListBox is required. It's not. The Math class is not going to change between one time someone runs your app and the next. It's not going to be different between one system and another. There's no downside to hard-coding the list of methods.