Treeview Issue in selecting Node

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ASP.NET

Hi,
I am getting issue in treeview selected node changed, not able to get the correct selected node. Always first child node is been selected. I have added my treeview nodes in this way

<asp:TreeView ID="trvRegionEnvMain" runat="server" OnSelectedNodeChanged="trvRegionEnvMain_SelectedNodeChanged"
                                    ImageSet="Simple" Width="142px">
                                    <HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" />
                                    <LeafNodeStyle ForeColor="Blue" />
                                    <NodeStyle Font-Names="Tahoma" Font-Size="10pt" ForeColor="Black" HorizontalPadding="0px"
                                        NodeSpacing="0px" VerticalPadding="0px" />
                                    <ParentNodeStyle Font-Bold="False" ForeColor="#990000" />
                                    <RootNodeStyle ForeColor="#006600" Font-Bold="True" />
                                    <SelectedNodeStyle Font-Underline="True" ForeColor="#FF0066" HorizontalPadding="0px"
                                        VerticalPadding="0px" BorderStyle="Outset" BorderWidth="2px" />
                                    <Nodes>
                                        <asp:TreeNode Text="Regions And Environments" Value="Root">
                                            <asp:TreeNode Text="G1"  Value="Region" SelectAction="SelectExpand">
                                                <asp:TreeNode  Text="ABC-4" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="CDE-28" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="APJ-3" Value="Environment" SelectAction="Select" />
                                                <asp:TreeNode  Text="Global-GlobalApps" Value="Environment" SelectAction="Select"/>
                                            </asp:TreeNode>
                                             <asp:TreeNode Text="G2"  Value="Region" SelectAction="SelectExpand">
                                                <asp:TreeNode  Text="ABC-6" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="CDE-29" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="APJ-20" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="Global-GlobalApps" Value="Environment" SelectAction="Select"/>
                                            </asp:TreeNode>
                                             <asp:TreeNode Text="G3"  Value="Region" SelectAction="SelectExpand">
                                                <asp:TreeNode  Text="ABC-1" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="CDE-Q" Value="Environment" SelectAction="Select"/>
                                                <asp:TreeNode  Text="APJ-9" Value="Environment" SelectAction="Select"/>
                                            </asp:TreeNode>
                                        </asp:TreeNode>
                                    </Nodes>
                                </asp:TreeView>


  protected void trvRegionEnvMain_SelectedNodeChanged(object sender, EventArgs e)
        {

            try
            {

                lblSiteName.Text = trvRegionEnvMain.SelectedNode.Text;

            }
            catch (Exception)
            {

                throw;
            }

        }

Thanks
sreenath