Repeater . in .aspx page. <asp:UpdatePanel ID="updatePanel3" runat="server" RenderMode="Inline"> <ContentTemplate> <asp:Repeater runat="server" ID="rptInvConfiguration" OnItemDataBound="rptInvConfiguration_ItemDataBound"> <HeaderTemplate> <table cellpadding="3" cellspacing="0" width="100%" id="tblInvconfig"> ...