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From Wiki

Summary: Using Page.IsValid

When you use Validator controls on a page, they automatically write out some javascript to force the user into following the validation you create. Let's take this simple example:

What this will do is make sure that the user enters a value into the TextBox before the page is submitted to the server. However, as this validation is done via javascript what happens if the user doesn't have javascript capabilities or has decided to disable it? Well, let's try it. Disable javascript in your browser, add the following code for the button click event and submit the form with no value in the TextBox:

What you will have seen is that although the "Please Enter A Value" message appears, the button click has also fired and executed the Response.Write and you will see the "I fired..." message. This is obviously not very good as now the user was able to submit the form without adhering to our validation controls. Fortunately, this is easy to fix with the Page.IsValid method. Change your code behind to include this check and then re-run the test:

You'll now notice that we have fixed the problem as the error message appears and you do not see the "I fired..." message.

This Hack is part of the ASP.NET Hacks collection