private void cboKhu1_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (cboKhu1.SelectedItem != null)
     {
         cboBan1.ItemsSource = mBOGopBan.GetVisualTablePerArea((Data.KHU)cboKhu1.SelectedItem);
     }
 }
 private void cboKhu1_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (cboKhu1.SelectedItem != null)
     {
         if (mIsTachBan)
         {
             cboBan1.ItemsSource = mBOTachGopBan.GetAllTableInOrderPerArea((Data.KHU)cboKhu1.SelectedItem, 0);
         }
         else
         {
             cboBan1.ItemsSource = mBOTachGopBan.GetVisualTablePerArea((Data.KHU)cboKhu1.SelectedItem);
         }
     }
 }