private void popddlCustomer()
 {
     try
     {
         DataTable dt = stock.GetCustomers();
         DataRow   dr = dt.NewRow();
         dr["ID"]   = "-1";
         dr["NAME"] = "Select";
         dt.Rows.InsertAt(dr, 0);
         ddlcustomer.DataTextField  = "NAME";
         ddlcustomer.DataValueField = "ID";
         ddlcustomer.DataSource     = dt;
         ddlcustomer.DataBind();
     }
     catch (Exception ex)
     {
         logger.Error(MODULE_NAME, "popddlStock", ex);
     }
 }