C# : Validate a TextBox Using an Error Provider




Validating a textbox is very important and there are many ways on how to do it. But, in this tutorial, I’m going to teach you the simplest way on how to validate a textbox by using an error provider. Error provider displays a user-friendly message to notify the user whenever validation fails. Then, that’s the time for the user to correct the error and validate the message in the textbox.


Let’s begin:


Open Microsoft Visual Studio and create a new windows form application. Then, drag two textboxes, labels, button and an error provider.


After setting up the form, double-click the “check” button and do the following codes for validating the textboxes.



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