C# 2008 Programmer's Reference

  ToolStripStatusLabel1.Text =
   ftpResp.StatusDescription.Replace('
',string.Empty);
 } catch (Exception ex) {
  MessageBox.Show(ex.ToString());
 }
}

When a new folder is created, you update the TreeView control to reflect the newly added folder. This is accomplished by the RefreshCurrentFolder() function:

private void RefreshCurrentFolder() {
 //---clears all the nodes and...---
 TreeView1.SelectedNode.Nodes.Clear();
 //---...create the nodes again---
 BuildDirectory(TreeView1.SelectedNode);
}

Removing a Directory

To remove (delete) a directory, a user first selects the folder to delete and then clicks the Remove Folder button. To delete a directory, you call the PerformWebRequest() helper function you defined earlier. This is accomplished with the Remove Folder button:

//---Remove a folder---
private void btnRemoveFolder_Click(object sender, EventArgs e) {
 if (TreeView1.SelectedNode.ImageIndex == ico_PHOTO) {
  MessageBox.Show('Please select a folder to delete.');
  return;
 }
 try {
  string FullPath =
   Properties.Settings.Default.FTP_SERVER +
   TreeView1.SelectedNode.FullPath.Substring(1).Replace('
', '');
  //---remove the folder---
  FtpWebResponse ftpResp =
   PerformWebRequest(FullPath, WebRequestMethod.RemoveDirectory);
  //---delete current node---
  TreeView1.SelectedNode.Remove();
  //---update the statusbar---
  ToolStripStatusLabel1.Text =
   ftpResp.StatusDescription.Replace('
', string.Empty);
 } catch (Exception ex) {
  MessageBox.Show(ex.ToString());
 }
}

If a directory is not empty (that is, if it contains files and subdirectories), the deletion process will fail. The user will have to remove its content before removing the directory. 

Uploading Photos

To upload photos to the FTP server, you first select a folder to upload the photos to and then use the OpenFileDialog class to ask the user to select the photo(s) he wants to upload. Finally, you upload the photos individually, using the UploadImage() function:

private void btnUploadPhotos_Click(object sender, EventArgs e) {
 //---ensure user selects a folder---
 if (TreeView1.SelectedNode.ImageIndex == ico_PHOTO) {
  MessageBox.Show('Please select a folder to upload the photos.');
  return;
 }
 OpenFileDialog openFileDialog1 = new OpenFileDialog() {
  Filter = 'jpg files (*.jpg)|*.jpg',
  FilterIndex = 2,
  RestoreDirectory = true,
  Multiselect = true
 };
 //---formulate the full path for the folder to be created---
 string currentSelectedPath =
  Properties.Settings.Default.FTP_SERVER +
  TreeView1.SelectedNode.FullPath.Substring(1).Replace('
', '');
 //---let user select the photos to upload---
 if (openFileDialog1.ShowDialog() ==
  System.Windows.Forms.DialogResult.OK) {
  //---upload each photo individually---
  for (int i = 0; i <= openFileDialog1.FileNames.Length - 1; i++) {
   UploadImage(currentSelectedPath + '/' +
    openFileDialog1.FileNames[i].Substring(
    openFileDialog1.FileNames[i].LastIndexOf(@'') + 1),
    openFileDialog1.FileNames[i]);
  }
 }
 //---refresh the folder to show the uploaded photos---
 RefreshCurrentFolder();
}

The UploadImage() function uploads a photo from the hard disk to the FTP server:

□ First, create a new instance of the WebClient class.

□ Specify the login credential to the FTP server.

□ Upload the file to the FTP server, using the UploadFile() method from the WebClient class. Note that the full pathname of the file to be uploaded to the FTP server must be specified.

//---upload a photo to the FTP server---
private void UploadImage(string path, string filename) {
 try {
  WebClient client = new WebClient();
  client.Credentials = new NetworkCredential(
   Properties.Settings.Default.UserName,
   Properties.Settings.Default.Password);
  //---upload the photo---
  client.UploadFile(path, filename);