protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataSet   dsItems = obQuoteRequest.Get_Quotation_Additional_Charge(UDFLib.ConvertToInteger(Request.QueryString["QuotationRequest_ID"]));
            DataTable dtItems = dsItems.Tables[0];
            if (Convert.ToInt32(dtItems.Rows[0]["id"]) == 0)
            {
                ViewState["IsNew"]    = true;
                gvItemList.DataSource = dtItems;
                gvItemList.DataBind();
            }
            else
            {
                ViewState["IsNew"]    = false;
                gvItemList.DataSource = dtItems;
                gvItemList.DataBind();

                string CalculateTotal = String.Format("CalculateTotal();");
                ScriptManager.RegisterStartupScript(Page, Page.GetType(), "CalculateTotal", CalculateTotal, true);
            }
            string CurrentSts = dsItems.Tables[1].Rows[0]["currentStatus"].ToString();
            if (CurrentSts == "NEW" || CurrentSts == "RFQ SENT" || CurrentSts == "QUOTE RECEIVED")
            {
                btnSaveItemDetails.Enabled = true;
            }
            else
            {
                btnSaveItemDetails.Enabled = false;
            }
        }
    }