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In my page, I have an LinkButton inside repeater, but the UpdatePanel cannot find the LinkButton to AsyncPostBackTrigger. Here is mycode.aspx <asp:ScriptManager ID="Test1" runat="server" /> <asp:UpdatePanel ID="TestUpdate" runat="server" UpdateMode="Always"> <ContentTemplate> <table width="100%"> <tr valign="top"> <td width="50%"> <asp:Repeater ID="productList" runat="server" onitemcommand="productList_ItemCommand"> <HeaderTemplate> <ul type="disc"> </HeaderTemplate> <ItemTemplate> <li> <asp:Label id="L1" runat="server" Text='<%# Eval("productName") %>'></asp:Label><br /> Price: <asp:Label runat="server" Text='<%# Eval("productPrice") %>' ></asp:Label>&nbsp;Bath<br /> <img alt="" src="Images/product/product<%# Eval("productID") %>.png" style="width: 200px; height: 130px" /><br /> <asp:TextBox ID="num_product" runat="server" Text="0"></asp:TextBox><br /> <asp:LinkButton ID="order_button" runat="server"><img alt="" src="~/Images/button/order.png" /></asp:LinkButton> </li> </ItemTemplate> <FooterTemplate> </ul> </FooterTemplate> </asp:Repeater> <td> <span class="labelText">Order list</span> <asp:BulletedList ID="orderList" runat="server" BulletStyle="Numbered"> </asp:BulletedList> </td> </tr> </table> </ContentTemplate> </asp:UpdatePanel> Here is mycode.aspx.cs protected void productList_ItemCommand(object source, RepeaterCommandEventArgs e) { //button /*LinkButton btn = new LinkButton(); btn.ID = "order_button";

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