Avoid Re-Bind of menu on master page load event( Inside !ISpostback)

if (!IsPostBack)
           
        {
        string sql1 = "sql query";
        DataTable dt = obj.RunSqlReturnDT(sql1);          
        Accordion1.DataSource = dt.DefaultView;
        Accordion1.DataBind();
       }

       Accordion1_ItemDataBound Event(Repeater bind inside accordion AS MENU)
       protected void Accordion1_ItemDataBound(object sender, AjaxControlToolkit.AccordionItemEventArgs e)
       {
         
        if (e.ItemType == AjaxControlToolkit.AccordionItemType.Header)
        {

            string a = (e.AccordionItem.FindControl("Label4") as Label).Text;
            ViewState["Categoryname"] = a;
        }
        if (e.ItemType == AjaxControlToolkit.AccordionItemType.Content)
        {
            string cat_name = ViewState["Categoryname"].ToString();
            sql ="sql query";
            Repeater Repeater1 = (Repeater)e.AccordionItem.FindControl("Repeater1");
            DataTable dt = obj.RunSqlReturnDT(sql11);
            Repeater1.DataSource = dt;
            Repeater1.DataBind();

        }
       
    }