You must consider carefully whether to implement a Web application by using either the ASP.NET MVC framework or the ASP.NET Web Forms model. The MVC framework does not replace the Web Forms model; you can use either framework for Web applications. (If you have existing Web Forms-based applications, these continue to work exactly as they always have.)
Before you decide to use the MVC framework or the Web Forms model for a specific Web site, weigh the advantages of each approach.
Please go through this: http://ideaofinnovation.blogspot.in/2010/08/deciding-when-to-create-mvc-application.html
