Do I need to sanitize input from ASP.NET MembershipProvider controls?

I'm using various ASP.NET co开发者_JAVA技巧ntrols out of the box such as the CreateUserWizard control, Login control etc... For custom controls, I have sanitized my inputs by making sure they conform to expected values. However, is this required for the controls such as the CreateUserWizard control, or is that handled internally? Do I need to provide any extra server side validation to these controls and, if so, would it be best to do it in the "CreateUserWizardControl_CreatingUser" event? Thanks

If input is coming from any form, then treat it as suspect. I've included some links here that may help you:

http://www.codersbarn.com/post/2008/11/01/ASPNET-Data-Input-Validation.aspx

If you have request validation enabled then form data with script tags will generate an error automatically.