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Help, I have searched many sites and found very few information on these in Visual Basic.
Updated 5-May-11 14:20pm

1 solution

If your doing the validation when the user tries to exit the control, I guess the simplest way is to use Validating[^] event. In that event you could use for example regex to check the input.

NumericUpDown automatically accepts only numbers and the MaskedTextBox has the Mask[^] property where you can define a proper mask.
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