Building a navigation in asp.net using treeview control

I'm trying to build a windows explorer like simple navigation menu in asp.net using a Treeview control And I have placed a Listview control which displays the children of the selected node dynamically.

Root    
  -Group01
    -subgroup1    
      -1.1    
      -1.2   
    -subgroup2    
      -1.1
-Group02

On pageload I have fixed the Treenode to 0 so Group01 and Group02 buttons are inserted in the Listview.

What I want to know is suppose I click on the Group01 button in the Listview it should display subgroup1 and subgroup1 and so on instead of the rootnode's children.

This is the .aspx code

<div>
<asp:TreeView ID="TreeView1" runat="server" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged">
    <Nodes>
        <asp:TreeNode SelectAction="SelectExpand" Text="root" Value="root">
            <asp:TreeNode Expanded="False" SelectAction="SelectExpand" Text="group01" Value="group01">
                <asp:TreeNode Text="subgroup1" Value="subgroup1">
                    <asp:TreeNode Text="1.1" Value="1.1"></asp:TreeNode>
                    <asp:TreeNode Text="1.2" Value="1.2"></asp:TreeNode>
                </asp:TreeNode>
                <asp:TreeNode Text="subgroup2" Value="subgroup2">
                    <asp:TreeNode Text="1.1" Value="1.1"></asp:TreeNode>
                </asp:TreeNode>
            </asp:TreeNode>
            <asp:TreeNode Expanded="False" SelectAction="SelectExpand" Text="group02" Value="group02">
            </asp:TreeNode>
       </asp:TreeNode>
    </Nodes>
</asp:TreeView>
</div>
 <div>
    <asp:ListView ID="ListView1" runat="server">
    </asp:ListView>
</div>

aspx.cs code

protected void Page_Load(object sender, EventArgs e)
{
    TreeView1.Nodes[0].Select();
    TreeView1_SelectedNodeChanged(this, EventArgs.Empty);
}
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
    ListView1.Controls.Clear();
    List<string> childs = new List<string>();
    for (int i = 0; i < TreeView1.SelectedNode.ChildNodes.Count; i++)
    {
        childs.Add(TreeView1.SelectedNode.ChildNodes[i].Text);
    }
    foreach (string val in childs)
    {
        Button btn = new Button
        {
            Text = val
        };
        ListView1.Controls.Add(btn);
        ListView1.Controls.Add(new LiteralControl("</br></br>"));
     }
}

Since I'm new to this I want to know whether this is the right way to do it or some alternatives.

Copyright Notice：Content Author:「rowkit」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/48970603/building-a-navigation-in-asp-net-using-treeview-control