Insert (Save) Selected TreeView nodes to database in ASP.Net

Here I have created sample.In this I have used recursion to get selected node.

HTML

<div>
    <h3>
        Vehicle Details</h3>
    <hr />
    <asp:TreeView ID="TreeView1" runat="server" ImageSet="XPFileExplorer" NodeIndent="15"
        ShowCheckBoxes="Leaf">
        <HoverNodeStyle Font-Underline="True" ForeColor="#6666AA" />
        <NodeStyle Font-Names="Tahoma" Font-Size="8pt" ForeColor="Black" HorizontalPadding="2px"
            NodeSpacing="0px" VerticalPadding="2px"></NodeStyle>
        <ParentNodeStyle Font-Bold="False" />
        <SelectedNodeStyle BackColor="#B5B5B5" Font-Underline="False" HorizontalPadding="0px"
            VerticalPadding="0px" />
    </asp:TreeView>
    <br />
    <br />
    <asp:Button Text="Save" runat="server" OnClick="Save" />
    <br />
    <br />
    <asp:GridView ID="gvFiles" runat="server" AutoGenerateColumns="true" />
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        if (!this.IsPostBack)
        {
            DriveInfo[] drives = DriveInfo.GetDrives();
            DirectoryInfo[] dirInfo = null;
            DirectoryInfo rootInfo = null;
            foreach (DriveInfo item in drives)
            {
                if (item.IsReady)
                {
                    dirInfo = item.RootDirectory.GetDirectories("Vehicles");
                    if (dirInfo.Length > 0)
                    {
                        rootInfo = dirInfo[0];
                        break;
                    }
                }
            }
            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)
        {
            TreeView1.Nodes.Add(directoryNode);
        }
        else
        {
            treeNode.ChildNodes.Add(directoryNode);
        }

        foreach (FileInfo file in directory.GetFiles())
        {
            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 Save(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] { new DataColumn("FileName"), new DataColumn("FileSize(Bytes)", typeof(int)), new DataColumn("FileModifiedDate", typeof(DateTime)) });
    DataTable selectedFileData = GetSelectedFiles(TreeView1.Nodes, dt);
    // Write Here Code to Save Data.
    gvFiles.DataSource = dt;
    gvFiles.DataBind();
}

private DataTable GetSelectedFiles(TreeNodeCollection nodes, DataTable dtSelectedFiles)
{
    if (nodes != null)
    {
        foreach (TreeNode node in nodes)
        {
            if (node.Checked)
            {
                FileInfo file = new FileInfo(node.Value);
                dtSelectedFiles.Rows.Add(file.Name, file.Length, file.LastWriteTime);
            }
            GetSelectedFiles(node.ChildNodes, dtSelectedFiles);
        }
    }
    return dtSelectedFiles;
}

Screenshot