We can combine ASP.NET MVC into an existing ASP.NET application by following the below procedure: 

First of all, you have to add a reference to the following three assemblies to your existing ASP.NET application: 

i) System.Web.Routing 
ii) System.Web.Abstractions 
iii) System.Web.Mvc 

The ASP.NET MVC folder should be created after adding these assembly references. 
Add the folder Controllers, Views, and Views | Shared to your existing ASP.NET application. 
And then you have to do the necessary changes in web.config file. 
For this you can refer to the below link: 

http://www.packtpub.com/article/mixing-aspnet-webforms-and-aspnet-mvc 
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