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The Custom Validator Control can be used on client side and server side.Java Script is used to do client validation and you can use any . I will explain you Custom Validator using server side. To write Custom Validator on server side you override Server Validate event.Regular Expression Validator Control A regular expression is a powerful pattern matching language that can be used to identify simple and complex characters sequence that would otherwise require writing code to perform.Using Regular Expression Validator server control, you can check a user's input based on a pattern that you define using a regular expression. These expressions can be phone number, email address, zip code and many more. Simply set the Validation Expression property to any type of expression you want and it will validate it.
At any cost server validation will work always whether client validation is executed or not. The attributes that are necessary to this control are: Maximum Value, Minimum Value, and Type.Your feedback and constructive contributions are welcome.The validation control classes are inherited from the Base Validator class hence they inherit its properties and methods.In such situation, a need might arise for performing validation separately for separate group.This kind of situation is handled using validation groups.