Validating textbox using javascript

You will use data annotations in the application model classes for user input validation, and finally, you will learn how to turn on or off request validation to individual controls in a page.Forms with complex data including validators tend to generate too much Java Script code in the page, which can represent about 60% of the code.NET to compare the HTML code generated by both configurations. NET 4.5 introduces data annotations validation for Web Forms.Instead of having a validation control on each input, you can now define constraints in your model classes and use them across all your web application.Setting this property will enable you to use a strongly-typed variable to receive the full benefits of the Visual Studio development experience, such as Intelli Sense, member navigation, and compile-time checking.With the data-bound controls, you can now also specify your own custom methods for selecting, updating, deleting and inserting data, simplifying the interaction between the page controls and your application logic.

This means you don't get Intellisense for the member names, support for code navigation (like Go To Definition), nor compile-time checking support.Additionally, model binding capabilities have been added to ASP.NET, which means you can map data from the page directly into method type parameters.With unobtrusive validation enabled, your HTML code will look cleaner and tidier.In this section, you will enable unobtrusive validation in ASP.

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