private CreateDiscrepencyReportControl GetControl()
 {
     if (createDiscrepancyReportControl == null)
         createDiscrepancyReportControl = new CreateDiscrepencyReportControl();
     return createDiscrepancyReportControl;
 }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                createDiscrepancyReportControl = GetControl();
                StationeryStoreInventorySystemController.Util.PutSession(sessionKey, createDiscrepancyReportControl);

                //FillItemsGridView();

                FillItems();
            }
            else
            {
                createDiscrepancyReportControl = (CreateDiscrepencyReportControl)StationeryStoreInventorySystemController.Util.GetSession(sessionKey);
            }
            FillItemsGridView();
        }