Validation in ASP.net

I want only letters and the special symbols / and - in my textbox.

How should be the expre开发者_JAVA技巧ssion like to give in custom validator?

Thanks In Advance

You should use a RegularExpressionValidator.

The expression should be something like ^[a-zA-Z/\-]+$

If the text cannot be empty, you need a RequiredFieldValidator aswell, as all the other validators are only called if the text is not empty.