public static Customer UpdateDb(this CustomerViewModel vm, Customer customer)
 {
     //customer.Id = vm.Id;
     customer.Name = vm.Name;
     customer.SourceId = vm.SourceId;
     return customer;
 }
        public void Update(Customer entity, bool commit)
        {
            if (entity == null)
                throw new ArgumentNullException("entity");

            _db.SaveChanges();
        }