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How to validate text in textbox control in winforms?
I have a control, where user have to put string, like “13:55”. I want to show MessageBox, when this value will be diffrent, than “XX:YY”.
How to do it?
In asp.net it was so easy to make, but how to implement it on winforms?
Check out the MaskedTextBox if you don’t want to have to validate in the first place.
If you want to make the first digit optional:
Otherwise, you could use a regular expression. 4 digits separated by a colon would be:
@"^\d{2}:\d{2}$". (The@symbol prevents C# from treating ‘\’ as an escape character – nothing unique to regex.)