Left join using LINQ

Question

Could someone give me an example of how to perform a left join operation using LINQ/lambda expressions?

Answer 1

For instance:

IQueryable q = db.aspnet_Roles
                    .Select(p => p.aspnet_UsersInRoles
                        .SingleOrDefault(x => x.UserId == iduser));

Will give you a list of roles from the asp.net membership, with nulls where it doesn't match the specified user (iduser key)