1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:

 public void ErstelleDirTreeviewDir(string directoryValue, TreeNode parentNode)
        {
            string[] directoryArray = Directory.GetDirectories(directoryValue);

            try
            {
                foreach (string directory in directoryArray)
                {
                    substringDirectory = directory.Substring(
                    directory.LastIndexOf('\\') + 1,
                    directory.Length - directory.LastIndexOf('\\') - 1);

                    TreeNode localNode = new TreeNode(substringDirectory);

                    parentNode.Nodes.Add(localNode);
                    ErstelleDirTreeviewDir(directory, localNode); 
                }

                string[] firstFileArray = Directory.GetFiles(directoryValue);

                foreach (string file in firstFileArray)
                {
                    substringFile = file.Substring(
                    file.LastIndexOf('\\') + 1,
                    file.Length - file.LastIndexOf('\\') - 1);

                    TreeNode fileNode = new TreeNode(substringFile);

                    fileNode.SelectedImageIndex = 1; //ausgewählter Node mit dem Bild Index 1
                    fileNode.ImageIndex = 1;    //Alle File Nodes erhalten den Bild Index 1
                    parentNode.Nodes.Add(fileNode);

                    fileNode.Tag = fileNode.Text;
                }
            }
            catch (UnauthorizedAccessException)
            {
                parentNode.Nodes.Add("Zugriff verweigert");
            }
        }					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:

TreeNode fileNode = new TreeNode(substringFile);
                    string dateityp = Path.GetExtension(substringFile); // findet heraus welchen dateityp die datei hat

                    fileNode.SelectedImageIndex = 1; //ausgewählter Node mit dem Bild Index 1
                    fileNode.ImageIndex = 1;    //Alle File Nodes erhalten den Bild Index 1


                    if (dateityp == ".html")
                    {
                        parentNode.Nodes.Add(fileNode);
                    }
                    else if (dateityp == ".htm")
                    {
                        parentNode.Nodes.Add(fileNode);
                    }