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Googling that uncovered a bunch of blog posts about how Visual Studio adds that line to the web.config when upgrading web apps from 1.1 to 3.5.The blog posts were mainly complaining about how that field interferes with .net's AJAX stuff, but I'm guessing it messes with the Java Script emitted for the Required Field Validator in a similar fashion.I've set the Control To Validate and it works flawlessly when there is no code inside the btn Submit Checkup_Click but if I try to put a code inside it, it will go forward and disregard the Required Field Validator.

Q: All the Required Field Validators are working when I make the btn Submit Checkup_Click property empty.You can use it to make sure that the user has entered something in a Text Box control.Let's give it a try, and add a Required Field Validator to our page.Most often, the purpose of data validation is to ensure correct user input.Validation can be defined by many different methods, and deployed in many different ways.

This is very important, since this code WILL be reached if the clientside validation is not used, for some reason.