Transaction in linq in asp.net MVC with Entity Framework 5.1

Hi Team , 
In my Code , i have used below transacation Scope class 
Thanks For reply , But When i am using  Emtity framework 5.1 . 
when i m using ,  the below code 
using (System.Transactions.TransactionScope scope = new System.Transactions.TransactionScope()) {
// Code

Scope.Complete();
}
But While Debugging  , or just after some time ,  the connection gets finished out.   It then Throws me the error as "failed to open an Underlying Connection".  Please Suggest How to Fix This .