private void btnSubmit_Click(object sender, RoutedEventArgs e) { try { ProjectRestaurantEntities _db = new ProjectRestaurantEntities(); var user = _db.users.FirstOrDefault(x => x.login == txtUsername.Text && x.password == txtPassword.Password); if (user != null && user.login == "admin") { AdminWindow dashboard = new AdminWindow(); dashboard.Show(); this.Close(); } else if (user != null && user.login == "chef") { ChefWindow forChef = new ChefWindow(); forChef.Show(); this.Close(); } else if (user != null && user.login == "accountant") { AccountantWindow forAccountant = new AccountantWindow(); forAccountant.Show(); this.Close(); } else if (user != null && user.login == "manager") { ProviderWindow forProvider = new ProviderWindow(); forProvider.Show(); this.Close(); } else if (user != null && user.login == "waiter") { WaiterWindow forWaiter = new WaiterWindow(); forWaiter.Show(); this.Close(); } else { MessageBox.Show("Користувача з такими даними не існує"); } } catch (SqlException ex) { MessageBox.Show(Convert.ToString(ex)); } }