Web Reference: Mar 3, 2014 · In simple terms, validation refers to ensuring entered data is well, valid. Determining whether or not data is valid can sometimes be a painstaking process as there are numerous tests that need to be thought of. Nov 12, 2010 · Use the Validating event to validate input. This is automatically triggered whenever the user leaves the input control, i.e. when they have finished their input, and a validation will not annoy the user. The MSDN documentation of the event gives an example of how this event is used correctly. May 7, 2025 · Learn about several ways that you can use Windows Forms to validate user input in your applications.
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