Unit of Work

1

http://www.asp.net/mvc/overview/older-versions/getting-started-with-ef-5-using-mvc-4/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application

2

http://www.c-sharpcorner.com/UploadFile/b1df45/unit-of-work-in-repository-pattern/

3

http://techbrij.com/generic-repository-unit-of-work-entity-framework-unit-testing-asp-net-mvc