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Question about the treeview in a updatepanel

Posted By:      Posted Date: September 03, 2010    Points: 0   Category :ASP.Net
 Hi,guys. I meet a question when i add a treeview in a updatepanel. I want that when I click the expand/collopse tag, it trigger the AsyncPostBackTrigger and the TreeNodeExpanded event, and when i select one node of this treeview, it trigger the PostBackTrigger and the SelectedNodeChanged event. In the SelectedNodeChanged event, I want to do "Response.Write". Now I program as the following: <asp:UpdatePanel ID="UpdatePanel1" runat="server">        <ContentTemplate>            <asp:TreeView ID="TreeView1" runat="server" OnTreeNodeExpanded="TreeView1_TreeNodeExpanded" OnSelectedNodeChanged = "TreeView1_SelectedNodeChanged">            </asp:TreeView>        </ContentTemplate>        <Triggers>        <asp:AsyncPostBackTrigger ControlID="TreeView1" EventName="TreeNodeExpanded" />        </Triggers>        </asp:UpdatePanel>   And: protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) { Reponse.Wri

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