How to perform Insert,Update,Delete operations on a table present in sqserver2008 in MVC3 using EntityFramework

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MVC3

Hii to all,
For the past 2weeks i started learning MVC,in this regard i want to perform simple Insert,Update,Delete operations from FrontEnd(i.e using MVC3)to a table present in SqlServer2008,i have searched in google but i didn't find the exact article,i have created a table called employee in a database which has the following columns EmpId,EName,Designation,DeptNo.Using MVC3 how can i perform all Insert,Update,Delete operations on employee table,please provide me with the steps for connecting to the database using EntityFramework and by writing some LINQ for all DML operations,when i was googling about performing this DML operations iam finding the DataContext class,please tell me what is this datacontext class where&how we can add this class.Thanks in advance

Thanks
Ramu