After you create a web form, you should make sure that mandatory fields of form elements such as login name and password are not left blank; data inserted is correct and is within specified range. Validation is method of scrutinizing that user has entered correct values in input fields. In HTML you can perform validation either by checking values at client-side or after submitting form at server-side. But these methods in HTML take lots of time to create and maintain code. Moreover, if user has disabled JavaScript then he or she may not receive message regarding error.

Therefore, in ASP.NET you can use ASP.NET Validation Controls while creating form and specify what ASP.NET Validation Controls you want to use and to which server control you want bind this. ASP.NET Validation Controls are derived from a common base class and share a common set of properties and methods. You just have to drag and drop ASP.NET Validation Control in web form and write one line of code to describe its functionality.

This reduces developer time from writing JavaScript for each type of validation. Moreover, through ASP.NET Validation Controls if any invalid data is entered browser itself detects error on client side and displays error without requesting server. This is another advantage because it reduces server load.

The five types of ASP.NET Validation Controls in ASP.NET Framework include:

ASP.NET Web Matrix is a development tool by Microsoft to create sophisticated web applications. Visual Studio.Net, another development tool, has lots of features such as creating windows applications, web services, and mobile application. But these very features of Visual Studio.Net make it bigger in size. Moreover, installing Visual Studio.Net needs 512MB of RAM. This, in contrast, ASP.NET Web Matrix is meant only to create ASP.NET web applications. Moreover, ASP.NET Web Matrix is “lightweight” and can be easily downloadable. The download size of ASP.NET Web Matrix is only 1.1 MB.