master page code:
<asp:UpdatePanel ID="Upi" runat="server">
<ContentTemplate>
<p class="text1" id="lbl_cart" runat="server"></p>
</ContentTemplate>
</asp:UpdatePanel>
client Page code:
<asp:UpdatePanel ID="Upi" runat="server">
<ContentTemplate>
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="images/add-button.png" OnClientClick="getcountr(this)"/>
</ContentTemplate>
</asp:UpdatePanel>
如何更新點擊imagebutton1的msater控制值...更新母版頁控制怎麼能做到這一點