how to signal WinForm control input out of range?

[thedougster]

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.

 

[softhemc]

Easy...

1: Create your own control, inherit from NumericUpDown

2: Create your own private field to hold this control's maxvalue

3: Add a public property for Maximum, Get = your private field, Set = (a) your private field, (b) your control's base class's Maximum to Decimal.MaxValue

4: Add a Handler for the TextChanged Event. Use Decimal.TryParse to validate the input and check it against your private maximim value. If it is within range then no problem otherwise set your control's Value property to the private field and throw an appropriate exception.