ASP.NET 4.5 has been improved and latest version ASP.NET. It includes an array of new and modified features. Today we’ll discuss one new feature Unobtrusive Validation that is introduced with ASP.NET 4.5 .
So what is Unobtrusive Validation?
In a normal validation scenario,when we use a validator to validate any any control and use Client side validation, some JavaScript is generated and rendered as HTML. Also some supportive JavaScript files is also get loaded by the browser for the validation.
Now with feature Unobtrusive Validation, inline JavaScript is not generated and rendered to handle the Client Side validation. Instead of this it uses HTML5 data-* attributes for all these validation.
Code Wala 