ASP.NET 4 Unleashed

Using Validation Groups

In the first version of the ASP.NET Framework, there was no easy way to add two forms to the same page. If you added more than one form to a page, and both forms contained validation controls, the validation controls in both forms were evaluated regardless of which form you submitted.

For example, imagine that you wanted to create a page that contained both a login and registration form. The login form appeared in the left column and the registration form appeared in the right column. If both forms included validation controls, submitting the login form caused any validation controls contained in the registration form to be evaluated.

Since the release of ASP.NET 2.0, you no longer face this limitation. The ASP.NET 2.0 ...