http://root-project.org/work/net/why-you-shouldnt-use-entity-framework-with-transactions/

bad_example.cs

using (var transaction = new System.Transactions.TransactionScope())
{
    // DBC = Database Command

    // create the database context
    var database = new DatabaseContext();

    // search for the user with id #1
    // DBC: BEGIN TRANSACTION
    // DBC: select * from [User] where Id = 1
    var userA = database.Users.Find(1);
    // DBC: select * from [User] where Id = 2
    var userB = database.Users.Find(2);
    userA.Name = "Admin";

    // DBC: update User set Name = "Admin" where Id = 1
    database.SaveChanges();

    userB.Age = 28;
    // DBC: update User set Age = 28 where Id = 2
    database.SaveChanges();

    // DBC: COMMIT TRANSACTION
    transaction.Complete();
}

good_example.cs

// DBC = Database Command

// create the database context
var database = new DatabaseContext();

// search for the user with id #1
// DBC: select * from [User] where Id = 1
var userA = database.Users.Find(1);
// DBC: select * from [User] where Id = 2
var userB = database.Users.Find(2);
userA.Name = "Admin";
userB.Age = 28;

// DBC: BEGIN TRANSACTION
// DBC: update User set Name = "Admin" where Id = 1
// DBC: update User set Age = 28 where Id = 2
// DBC: COMMIT TRANSACTION
database.SaveChanges();