public string validateLogin(Customer data) { bool passwordCorrect = false; string idNumber = data.ID; string password = data.password; using (netfloristEntities3 entity = new netfloristEntities3()) { var user = entity.Customers.Where(u => u.ID == idNumber).FirstOrDefault(); if (user != null) { if (password == user.password) { Session["LoginID"] = user.ID; Session["UserName"] = user.firstName + ' ' + user.lastName; return(user.ID.ToString()); } else { return("0"); } } else { return("-1"); } } }