I want to display root nodes of tree view in ASP .NET page load and then after for each node click it will display data of that node.

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C#

ASP.NET

I want to display root nodes of tree view in asp .net page load and then after for each node click it will display data of that node.

When I click on first root it will display only first root data.
now when I click second root node It will display second root data hide first root data which i earlier click.

Also What ever root node I have selected I want display all files details in gridview
i.e file name, created date ,file path size ect.

Also want to display selected file data in text Editor.

What I have tried:

Aspx Code is as follows

    <div>
       <h3>
    Vehicle Details</h3>
<hr>
<asp:TreeView ID="TreeView1" runat="server" ImageSet="XPFileExplorer" NodeIndent="15" OnTreeNodeExpanded="TreeView1_TreeNodeExpanded">
    <HoverNodeStyle Font-Underline="True" ForeColor="#6666AA" />
    <NodeStyle Font-Names="Tahoma" Font-Size="8pt" ForeColor="Black" HorizontalPadding="2px"
        NodeSpacing="0px" VerticalPadding="2px">
    <ParentNodeStyle Font-Bold="False" />
    <SelectedNodeStyle BackColor="#B5B5B5" Font-Underline="False" HorizontalPadding="0px"
        VerticalPadding="0px" />


        <hr>
        <asp:GridView ID="GridView1" runat="server">
    </div>

Aspx.cs file code is as follows

public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                DirectoryInfo rootInfo = new DirectoryInfo(Server.MapPath("~/Vehicles/"));
                this.PopulateTreeView(rootInfo, null);
            }
        }

        private void PopulateTreeView(DirectoryInfo dirInfo, TreeNode treeNode)
        {
            foreach (DirectoryInfo directory in dirInfo.GetDirectories())
            {
                TreeNode directoryNode = new TreeNode
                {
                    Text = directory.Name,
                    Value = directory.FullName
                };

                if (treeNode == null)
                {
                    //If Root Node, add to TreeView.
                    TreeView1.Nodes.Add(directoryNode);
                }
                else
                {
                    //If Child Node, add to Parent Node.
                    treeNode.ChildNodes.Add(directoryNode);
                }

                //Get all files in the Directory.
                foreach (FileInfo file in directory.GetFiles())
                {
                    //Add each file as Child Node.
                    TreeNode fileNode = new TreeNode
                    {
                        Text = file.Name,
                        Value = file.FullName,
                        Target = "_blank",
                        NavigateUrl = (new Uri(Server.MapPath("~/"))).MakeRelativeUri(new Uri(file.FullName)).ToString()
                    };
                    directoryNode.ChildNodes.Add(fileNode);
                }

                PopulateTreeView(directory, directoryNode);
            }
        }

       

        protected void TreeView1_TreeNodeExpanded(object sender, TreeNodeEventArgs e)
        {
            GetFilesAndFolders();
            //if (e.Node.Parent == null)
            //    return;
            //string strNodeValue = e.Node.Value;
            //foreach (TreeNode node in e.Node.Parent.ChildNodes)
            //{
            //    if (node.Value != strNodeValue)
            //        node.Collapse();
            //}
        }

        public void GetFilesAndFolders()
        {
            DirectoryInfo dirInfo = new DirectoryInfo(Server.MapPath("~/Vehicles"));
            FileInfo[] fileInfo = dirInfo.GetFiles("*.*", SearchOption.AllDirectories);
            GridView1.DataSource = fileInfo;
            GridView1.DataBind();
        }
    }

It Is Displaying all root node and all its child node on page load. Instead of that I want to display only All root nodes.
also it is displaying all files details of all child of all root on grid instead I want only selected root childs only