Label Is Not Updating As I Am Changing Values

See more:

C#

.NET

Hi,

I am writing a small program to manage store and price based on the item quantity. In the desire functionality I want the Grand Total of all items cost to be displayed in the label. This label updates as i change the values in qty text boxes.
So far i have done writing this code and it is working perfectly and even the values are exactly the same in variables as i want but the problem is label doesn't update even i have null values in the qty text boxes. It keep shows the previous total until i change the values, and it seems get stuck on the last updated total.

namespace wpfTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        List<int> myList = new List<int>();
        int val1, val2;
        int total;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            qtyTxt1.IsEnabled = false;
            priceTxt1.IsEnabled = false;

            qtyTxt2.IsEnabled = false;
            priceTxt2.IsEnabled = false;
        }

        private void chk1_Click(object sender, RoutedEventArgs e)
        {
            if (chk1.IsChecked == true)
            {
                qtyTxt1.IsEnabled = true;
                priceTxt1.IsEnabled = true;
            }
            else
            {
                qtyTxt1.IsEnabled = false;
                priceTxt1.IsEnabled = false;

                qtyTxt1.Clear();
                priceTxt1.Text = "@50";
            }
        }

        private void chk2_Click(object sender, RoutedEventArgs e)
        {
            if (chk2.IsChecked == true)
            {
                qtyTxt2.IsEnabled = true;
                priceTxt2.IsEnabled = true;
            }
            else
            {
                qtyTxt2.IsEnabled = false;
                priceTxt2.IsEnabled = false;

                qtyTxt2.Clear();
                priceTxt2.Text = "@100";
            }
        }

        private void qtyTxt1_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (qtyTxt1.Text=="")
            {
                priceTxt1.Text = "@50";
                val1 = 0;
            }
            if (qtyTxt1.Text.Length > 0)
            {
                priceTxt1.Text = (Convert.ToInt32(qtyTxt1.Text) * 50).ToString();
                val1 = Convert.ToInt32(priceTxt1.Text);
                updateTotal();
            }
        }

        private void qtyTxt2_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (qtyTxt2.Text.Length == 0)
            {
                priceTxt2.Text = "@100";
                val2 = 0;
            }
            if (qtyTxt2.Text.Length > 0)
            {
                priceTxt2.Text = (Convert.ToInt32(qtyTxt2.Text) * 100).ToString();
                val2 = Convert.ToInt32(priceTxt2.Text);
                updateTotal();
            }
        }

        private void updateTotal()
        {
            total = 0;
            total = val1 + val2;
            totalTxt.Clear();
            totalTxt.Text = (val1 + val2).ToString();
            
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Total : " + total + "\n" + "Val1 : " + val1 + "\n" + "Val2 : " + val2);
        }
      
    }
}

I have also uploaded screen shot at my Microsoft onedrive account because i have limitation here to upload photograph.

[^]

Thanks