public int InsertEmployee(LMEmployee employee)
        {
            int result = -1;

            try {
                Employees.AddOrUpdate(employee);
                result = this.SaveChanges();
            }
            catch (DbEntityValidationException e)
            {
                foreach (var eve in e.EntityValidationErrors)
                {
                    Console.WriteLine("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
                                      eve.Entry.Entity.GetType().Name, eve.Entry.State);
                    foreach (var ve in eve.ValidationErrors)
                    {
                        Console.WriteLine("- Property: \"{0}\", Error: \"{1}\"",
                                          ve.PropertyName, ve.ErrorMessage);
                    }
                }

                throw;
            }

            if (result != -1)
            {
                result = 1;
            }

            return(result);
        }