what is the role of Ninject and role of Entityframework MVC?

Ninject is an Inversion of Control container.

What does it do?

Suppose you have a Car class that depends on a Driver class.

public class Car 

{

   public Car(IDriver driver)

   {

      ///

   }

}

In order to use the Car class you build it like so:

IDriver driver = new Driver();

var car = new Car(driver);

A IoC containter centralizes the knowledge about how to build classes. It is a central repository that knows a few things. For example, it knows that the concrete class that you need to use to build a car is a Driver and not any other IDriver.

For example, if you are developing a MVC application, you can tell Ninject how to build your controllers. You do so by registering which concrete classes satisfy specific interfaces. At run time Ninject will figure out which classes are needed to build the required controller, and all behind the scenes.

// Syntax for binding

Bind().To();

This is beneficial because it lets you build systems that are more easily unit testable. Suppose that Driver encapsulates all database access for Car. In a unit test for Car you can do this:

IDriver driver = new TestDriver(); // a fake driver that does not go to the db

var car = new Car(driver);

There are entire frameworks that take care of automatically creating testing classes for you and they are called mocking frameworks

follow this link :

http://gizmoblogr.com/788/dependency-injection-using-ninject-asp-net-mvc

http://forums.asp.net/t/1744074.aspx?What+is+Ninject+

Entity Framework:

Ef is used to create the models in mvc, m - model v- view c- controller so m is created as an edmx file u can grab the complete schema of database and retrive the data from the database by writing the linq to entities queries 

for EF please follow this link

http://blogs.msdn.com/b/webdev/archive/2014/03/04/tutorial-series-for-entity-framework-6-mvc-5-published.aspx