删除你的javascript代码，并将onclick属性添加到你的按钮，如下所示

remove your javascript code and add the onclick attribute to your button as below

<asp:button id="Button2" runat="server" text="Ok"

            Width="123px" OnClick="ImageButton10_Click"  ></asp:button>

你不想调用脚本调用服务器端代码。

you dont want to call script to calling the Server side code.