public void EditClass(int id, string code, string name, DateTime birthday, string address, string location, int salary) { var db = new MyDatabaseEntities(); var oldEmployee = db.Employees.Find(id); oldEmployee.Code = code; oldEmployee.Name = name; oldEmployee.Birthday = birthday; oldEmployee.Address = address; oldEmployee.Location = location; oldEmployee.Salary = salary; db.Entry(oldEmployee).State = System.Data.Entity.EntityState.Modified; db.SaveChanges(); }