Validating date with rangevalidator control in
If you prefer, you can disable client-side validation for any of the validation controls by assigning the value property.When you use an uplevel browser that supports Java Script with the validation controls, you are prevented from submitting a form back to the server when there are validation errors.Server-Side Validation: When validation occurs on the server, then it is known as Server-Side Validation.
You are provided with sample code for using each of the standard validation controls.
By default, the validation controls perform validation on both the client (the browser) and the server.
The validation controls use client-side Java Script.
Supported browsers include Internet Explorer, Firefox, and Opera. NET, which supported only Internet Explorer as an uplevel browser.
You can use the validation controls with browsers that do not support Java Script (or do not have Java Script enabled). So, validation is a good idea to do whenever we are taking input from the user.