为什么在html脚本里加入：OnPageIndexChanged="..."就出错，无法预览

Question

见下面脚本的最后一句话：
<td class="rbodycol" height="25"><asp:datagrid id=TopicListDataGrid runat="server" Width="100%" BorderWidth="1px" BorderStyle="None" CellPadding="3" AllowPaging="True" BackColor="White" AutoGenerateColumns="False" GridLines="Vertical" DataSource="<%# ItemList %>" BorderColor="#999999" AllowSorting="True" AllowCustomPaging="True" PageSize="20" OnPageIndexChanged="TopicListDataGrid_PageIndexChanged">以上脚本相关联的后台代码：
private void TopicListDataGrid_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
ShowTopicsByPage(e.NewPageIndex);
}

Answer 1

把前台页面中的OnPageIndexChanged去掉放到后台代码中关联

Answer 2

原因找到了:
private void TopicListDataGrid_PageIndexChanged(object sender, DataGridPageChangedEventArgs e)
应该写成:
public void TopicListDataGrid_PageIndexChanged(object sender, DataGridPageChangedEventArgs e)
private和public的一字之差.谢谢各位了