ASP.NET MVC 5: Using a Simple Repository Pattern for Performing Database Operations

http://www.dotnetcurry.com/aspnet-mvc/1155/aspnet-mvc-repository-pattern-perform-database-operations

Dependency Injection Best Practices in an N-tier Modular Application

http://www.developer.com/net/dependency-injection-best-practices-in-an-n-tier-modular-application.html