private void lstSalesOrder_SelectedIndexChanged(object sender, EventArgs e)
 {
     if (!(lstSalesOrder.SelectedIndex < 0))
     {
         int param = 0;
         //Convert.ToInt32(lstPurchaseOrder.SelectedValue.ToString());
         Int32.TryParse(lstSalesOrder.SelectedValue.ToString(), out param);
         TransactionData.DataSource            = GeneralMethods.GetSalesOrderTransaction(param);
         dgvSalesOrdersTransactions.DataSource = TransactionData;
     }
 }