C # view Image Browsing in a specified folder

Using system;
Using system. collections;
Using system. componentmodel;
Using system. Data;
Using system. drawing;
Using system. Web;
Using system. Web. sessionstate;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. htmlcontrols;
Using Microsoft. Web. UI. webcontrols;
Using system. IO;

Namespace treeviewtest
{
/// <Summary>
/// Summary of treeviewtest.
/// </Summary>
Public class treeviewtest: system. Web. UI. Page
{
Protected system. Web. UI. webcontrols. Image image1;
Protected Microsoft. Web. UI. webcontrols. Treeview treeview1;
Private void page_load (Object sender, system. eventargs E)
{
// Place user code here to initialize the page
If (! This. ispostback)
{
This. image1.imageurl = @ "D: \ photos \ huoying \ ecbbc2ded2bbbabd3e01.jpg ";
Showtreeview ();
}
}

Private void showtreeview ()
{
Try
{
String filepath = @ "D: \ photos ";
This. treeview1.nodes. Clear ();
Treenode TD = new treenode ();
TD. Text = filepath;
Treeview1.nodes. Add (TD );
Getallfiles (filepath, TD );
Getdir (TD, filepath );
}
Catch (exception ERR)
{
String strerro = err. message;
// Response. Write (ERR. Message );
// Response. Write (ERR. source );
// Response. Write (ERR. stacktrace );
}
}

// Get the file name
Private void getallfiles (string path, treenode currentnode)
{
Directoryinfo maindir = new directoryinfo (PATH );
Try
{
Foreach (fileinfo files in maindir. getfiles ())
{
Treenode TD = new treenode ();
TD. Text = files. Name;
TD. ID = files. fullname;
// Response. Write (files. fullname );
Currentnode. nodes. Add (TD );
}
}
Catch (exception ERR)
{
String strerro = err. message;
// Response. Write (ERR. Message );
// Response. Write (ERR. source );
// Response. Write (ERR. stacktrace );
}
}

// Obtain the folder path
Private void getdir (treenode currentnode, string path)
{
Try
{
Directoryinfo maindir = new directoryinfo (PATH );
Foreach (directoryinfo D in maindir. getdirectories ())
{
Treenode TD = new treenode ();
TD. Text = D. Name;
// TD. ID = D. fullname;
// Response. Write (D. fullname );
Currentnode. nodes. Add (TD );
Getallfiles (path + @ "\" + D. Name, TD );
Getdir (TD, path + @ "\" + D. Name );
}
}
Catch (exception ERR)
{
String strerro = err. message;
// Response. Write (ERR. Message );
// Response. Write (ERR. source );
// Response. Write (ERR. stacktrace );
}
}