Asp. Method of using TreeView to display files in net _ practical tips

In ASP.net, the use of the TreeView is common, and it is used to

First join the TreeView control

<asp:treeview id= "Driverinfoview" runat= "imageset=" Xpfileexplorer "ontreenodepopulate=" DriverInfoView_ Treenodepopulate ">
</asp:TreeView>

When the page loads, write down the following code

protected void Page_Load (object sender, EventArgs e) 
{ 
foreach (DriveInfo driverinfo in Driveinfo.getdrives ()) c5/>{ 
TreeNode newNode = new TreeNode (); 
newnode.expanded = false; 
Newnode.populateondemand = true; 
Newnode.value = Driverinfo.name; 

if (Driverinfo.isready) 
{ 
Newnode.text = driverinfo.name + "(" + Driverinfo.volumelabel + ")"; 
} 
else 
{ 
Newnode.text = driverinfo.name + "(Not ready yet)"; 
} 
THIS.DRIVERINFOVIEW.NODES.ADD (NewNode); 
} 

Setting events for the TreeView node

 protected void Driverinfoview_treenodepopulate (object sender, TreeNodeEventArgs e) { 

DirectoryInfo dictinfo = new DirectoryInfo (e.node.value); 
foreach (DirectoryInfo directory in Dictinfo.getdirectories ()) {TreeNode NewNode = new TreeNode (); 
newnode.expanded = false; 
Newnode.populateondemand = true; Newnode.text = Directory. 
Name; Newnode.value = Directory. 
FullName; 
E.node.childnodes.add (NewNode); 
foreach (FileInfo FileInfo in Dictinfo.getfiles ()) {TreeNode NewNode = new TreeNode (); 
Newnode.text = Fileinfo.name; 
Newnode.value = Fileinfo.fullname; 
E.node.childnodes.add (NewNode); }
}