C# : Validate a TextBox Using an Error Provider


Validate a TextBox Using an Error Provider in C#


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 text boxes, 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.



For all students who need a programmer for your thesis system or anyone who needs a source code in any programming languages. You can contact me @ :

Email – [email protected]
Mobile No. – 09305235027 – TNT

You can try the Visual Basic.Net version of Validation textbox error using the ErrorProvider Tool.

Download Sourcecode

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.