TreeView ASP.NET

[kashif73]

Hi I am pretty new to ASP.NET. I have inserted a Treeview control in my page, which display directory information & all the different files contained in it in a DataList infront of it. My question is how can I make users to OPEN or DOWNLOAD these files. rightnow throuh this code only the name of the file is displayed in DataList, I want them to open in their respective programs & be downloaded as well. Thanks.

PictureTree is my TREEVIEW &
PicturesInFolde r is my DATALIST which display files in that folder

Imports System.IO
Partial Class folder
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        'On the first page visit, populate the photo tree and select the root node
        If Not Page.IsPostBack Then
            PopulateTree()
            PictureTree.Nodes(0).Select()
            PictureTree_SelectedNodeChanged(PictureTree, EventArgs.Empty)
        End If
    End Sub
    Private Const VirtualImageRoot = "~/Data/"
    Private Sub PopulateTree()
        'Populate the tree based on the subfolders of the specified VirtualImageRoot
        Dim rootFolder As New DirectoryInfo(Server.MapPath(VirtualImageRoot))
        Dim root As TreeNode = AddNodeAndDescendents(rootFolder, Nothing)
        'Add the root to the TreeView
        PictureTree.Nodes.Add(root)
    End Sub
    Private Function AddNodeAndDescendents(ByVal folder As DirectoryInfo, ByVal parentNode As TreeNode) As TreeNode
        'Add the TreeNode, displaying the folder's name and storing the full path to the folder as the value...
        Dim virtualFolderPath As String
        If parentNode Is Nothing Then
            virtualFolderPath = VirtualImageRoot
        Else
            virtualFolderPath = parentNode.Value & folder.Name & "/"
        End If
        Dim node As New TreeNode(folder.Name, virtualFolderPath)
        'Recurse through this folder's subfolders
        Dim subFolders As DirectoryInfo() = folder.GetDirectories()
        For Each subFolder As DirectoryInfo In subFolders
            Dim child As TreeNode = AddNodeAndDescendents(subFolder, node)
            node.ChildNodes.Add(child)
        Next
        Return node     'Return the new TreeNode
    End Function
    Protected Sub PictureTree_SelectedNodeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PictureTree.SelectedNodeChanged
        'Refresh the DataList whenever a new node is selected
        DisplayPicturesInFolder(PictureTree.SelectedValue)
    End Sub
    Private Sub DisplayPicturesInFolder(ByVal virtualFolderPath As String)
        'Security check: make sure folderPath starts with VirtualImageRoot and doesn't include any ".."
        If Not virtualFolderPath.StartsWith(VirtualImageRoot) OrElse virtualFolderPath.IndexOf("..") >= 0 Then
            Throw New ApplicationException("Attempting to view a folder outside of your root folder!")
        End If
        'Get information about the files in the specified folder
        Dim folder As New DirectoryInfo(Server.MapPath(virtualFolderPath))
        Dim fileList As FileInfo() = folder.GetFiles()
 
        PicturesInFolder.DataSource = fileList
        PicturesInFolder.DataBind()
        'subNode.NavigateUrl = Server.MapPath(fi.Name.ToString())
        'If there are no pictures in the folder, display the NoPicturesInFolderMessage Label
        PicturesInFolder.Visible = PicturesInFolder.Items.Count > 0
        NoPicturesInFolderMessage.Visible = Not PicturesInFolder.Visible
    End Sub
 

[Frinavale]

You need to give the user a way to select the file they want to view/download.
Add a Select Button (or CheckBox column if you want to let them download more than one file) to your GridView. When the user clicks the Select button, display a link to let them download the file selected.