public BillUserControl1()
        {
            InitializeComponent();
            var itemsource = new ReceiptVMs();

            ReceiptDataGrid.ItemsSource = itemsource.models;
        }
 void reloadData()
 {
     try
     {
         ReceiptDataGrid.ItemsSource = null;
         var itemsource = new ReceiptVMs();
         ReceiptDataGrid.ItemsSource = itemsource.models;
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }