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Unicorn - W3C's Unified Validator Validate by URI In W3Cx's hands-on Professional Certificate Program, learn how to code the right way by creating Web NET starting from Environment Setup, Basic Controls, Directives, Event Handling, Life Cycle, ADO. NET validation controls validate the user input data to ensure that useless, unauthenticated, or contradictory . Net language, like C# or VB. 19 Apr 2018 The .NET Framework contains a variety of validation controls that, when placed on an ASP.NET Web Forms page, validate user input entered Custom validator with Javascript : CustomValidator « Validation « ASP.NET Tutorial. Inherits="UsingCustomValidator" %> https://www.w3schools.com/simpleform.asp?fname=Bill&lname=Gates A good way to validate a form on the server is to post the form to itself, instead of