C# – using UpdatePanel for asp.net tree view SelectedNodeChanged event

asp.netctextboxtreeviewupdatepanel

I have TextBox and treeview likes ,

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtName" runat="server" Width="150px" ReadOnly="true"
BorderStyle="Double">
</asp:TextBox>
</ContentTemplate>  
</asp:UpdatePanel>  

<asp:TreeView ID="TreeView1" runat="server" ImageSet="Arrows"   
OnSelectedNodeChanged="TreeView1_SelectedNodeChanged" >
<NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px"
NodeSpacing="0px" VerticalPadding="0px" />
<SelectedNodeStyle CssClass="treeHover"></SelectedNodeStyle>
</asp:TreeView>

Coding for SelectedNodeChanged event ,

protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{      
    txtName.Text = TreeView1.SelectedNode.Text;
}

My Update Panel doesn't work properly ,I want to know what's wrong in my code ?

Best Answer

Try this....

 <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
    <asp:TextBox ID="txtName" runat="server" Width="150px" ReadOnly="true"
    BorderStyle="Double">
    </asp:TextBox>
    </ContentTemplate>  
     <Triggers>
            <asp:AsyncPostBackTrigger ControlID="TreeView1" EventName="SelectedNodeChanged" />
            </Triggers>
    </asp:UpdatePanel>  

    <asp:TreeView ID="TreeView1" runat="server" ImageSet="Arrows"   
    OnSelectedNodeChanged="TreeView1_SelectedNodeChanged" >
    <NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px"
    NodeSpacing="0px" VerticalPadding="0px" />
    <SelectedNodeStyle CssClass="treeHover"></SelectedNodeStyle>
    </asp:TreeView>
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