How to rollback a transaction in Entity Framework

Question

string[] usersToAdd = new string[] { "asd", "asdert", "gasdff6" };
using (Entities context = new Entities())
{
    foreach (string user in usersToAdd)
    {
        context.AddToUsers(new User { Name = user });
    }
    try
    {
        context.SaveChanges(); //Exception thrown: user 'gasdff6' already exist.
    }
    catch (Exception e)
    {
        //Roll back all changes including the two previous users.
    }

Or maybe this is done automatically, meaning that if error occurs, committing changes are canceled for all the changes. is it?

Answer 1

OK

I created a sample a application like the example from the the question and afterwords I checked in the DB and no users were added.

Conclusion: ObjectContext.SaveChange it's automatically a transaction.

Note: I believe transactions will be needed if executing sprocs etc.