private void back_Click(object sender, RoutedEventArgs e)
        {
            ViewCustomers viewCustomers = new ViewCustomers();

            viewCustomers.Show();
            this.Close();
        }
        private async void saveButton_Click(object sender, RoutedEventArgs e)
        {
            val = new Validation();
            if (val.isEmpty(firstName) || val.isEmpty(lastName) || val.isEmpty(addressLine1) || val.isEmpty(addressLine2) ||
                val.isEmpty(addressLine3) || val.isEmpty(email) || val.isEmpty(mobileContact.ToString()) || val.isEmpty(homeContact.ToString()))
            {
                await this.ShowMessageAsync("Error", "Input Data Cannot Be Empty", MessageDialogStyle.Affirmative);
            }
            else
            {
                int affectedLines = 0;
                customer = new CustomerData();

                customer.setFirstName(FirstName.Text);
                customer.setLastName(LastName.Text);
                customer.setAddress(Address1.Text + ' ' + Address2.Text + ' ' + Address3.Text);
                customer.setEmail(Email.Text);
                customer.setMobileNumer(Convert.ToInt32(MobileContact.Text));
                customer.setFixedNumber(Convert.ToInt32(HomeContact.Text));
                try
                {
                    handleDatabase = new HandleDatabase();
                    affectedLines  = handleDatabase.executeCustomerUpdate(customer, customerID);

                    if (affectedLines > 0)
                    {
                        await this.ShowMessageAsync("Successfull", "Customer have been Successfully Updates", MessageDialogStyle.Affirmative);

                        ViewCustomers view = new ViewCustomers();
                        view.Show();
                        this.Close();
                    }
                    else
                    {
                        await this.ShowMessageAsync("Error", "Sorry Can not Update, Please Try again", MessageDialogStyle.Affirmative);

                        ViewCustomers view = new ViewCustomers();
                        view.Show();
                        this.Close();
                    }
                }
                catch (SqlException sqlException)
                {
                    Console.WriteLine(sqlException);
                }
            }
        }