Validating custom control

In this article, we will explore how to create a custom validation control in ASP.NET and provide both Server and Client Side Validation for the same.Also see Web Site Testing FAQ in the FAQ Part 2 for a discussion of web site testing considerations; also see What's the best way to choose a test automation tool?in the LFAQ section; there are also articles about web site testing and management in the 'Resources' section.

However, when I apply a Regular Expression Validator to an asp: Text Box to check if it's null or not, it doesn't validate when the box is empty. shoud i change soething when i do it for a us phone number. Works great for the e-mail validation but then when i add a phone validation or zip code validation it does not work. The other is a converted formfield which is now a textbox with a validator. If Field 1 = 2 then user must fill the next field - Field 2. Thanks, Singh I get the error: Control 'ff11_1' referenced by the Control To Validate property of 'Required Field Validator1' cannot be validated 'ff11_1' is the ID of the control to be validated, but it seems to be wrong.

Since this tutorial hasn't treated database access yet, we will do a simpler example, but hopefully you will see that you can do just about everything with the Custom Validator.

The control allows you to validate both clientside and serverside, where the serverside approach is probably the most powerful. Value, which is the string of the control being validated, for it's length.

This is a very basic and that useful example, only made to show you how you may use the Custom Validator.

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