Check Username Availability (Exists) in Database using jQuery AJAX in ASP.Net MVC

Here Mudassar Ahmed Khan has explained with an example, how to check Username availability i.e. check whether Username exists in database or not using jQuery AJAX and Entity Framework in ASP.Net MVC Razor. This article will illustrate how to check Username availability in database on Registration Form by making AJAX call to database using jQuery AJAX and Entity Framework in ASP.Net MVC Razor.