how to signal WinForm control input out of range?

Question

Is there a way (perhaps via EventArgs) to signal the app when a user tries to enter out-of-range input into a WinForm control? (Specifically a number in a NumericUpDown control numericUpDown1 that is larger than numericUpDown1.Maximum?) Yes I know the control won't allow the input but I want to display an error message if this happens.

Bechir Bejaoui · Answer

You can derive a customized exeption and invoke it public class NumericUpDownException : ApplicationException { public NumericUpDownException() { } public NumericUpDownException(string message) : base(Index out of range exception) { } public void Trigger(NumericUpDown control) { if (control.Maximum { throw this; } } }