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using (StreamWriter writer = new StreamWriter(Application.UserAppDataPath + "\\paths.txt")) {
  writer.WriteLine("erste Zeile");
  writer.WriteLine("zweite Zeile");
}					

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if (File.Exists(Application.UserAppDataPath + "\\paths.txt")) {
  using (StreamReader reader = new StreamReader(Application.UserAppDataPath + "\\paths.txt")) {
    MessageBox.Show(reader.ReadLine());
  }
}					

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class ListEntry {
  private string fileName;
  private string displayName;

  public ListEntry(string fileName, string displayName) {
    this.fileName = fileName;
    this.displayName = displayName;
  }

  public ListEntry(string serialized) {
    // serialized ist ein String der Form "fileName=displayName"

    // Also suchen wir nach dem letzten Vorkommen eines Gleichheitszeichens
    int equalSignPos = serailized.LastIndexOf('=');

    // Der Dateiname ist links vom Zeichen, der Anzeigename rechts davon.
    this.fileName = serialized.Substring(0, equalSignPos-1);
    this.displayName = serialized.Substring(equalSignPos+1);
  }

  public string FileName { get { return fileName; } set {fileName = value; } }
  public string DisplayName { get { return displayName; } set {displayName = value; } }

  public string Serialize() {
    return fileName + "=" + displayName;
  }

  public string ToString() {
    return displayName;
  }
}					

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object item = listBox1.Items[listBox1.SelectedIndex];
ListEntry entry = (ListEntry)item;
Ausführen(entry.FileName);					

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string sFile = Application.StartupPath + "\\Liste.xml";
System.IO.StreamWriter oStream = null;
int i = 0;
oStream = new System.IO.StreamWriter(sFile);
while(i < listBox1.Items.Count)
{
    oStream.WriteLine(listBox1.Items[i]);
    i = i + 1 ;
}
oStream.Close();					

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            string sFile = Application.StartupPath + "\\Liste.xml";
            System.IO.StreamReader oStream = null;
            string sLine = null;
            listBox1.Items.Clear();
            System.IO.FileInfo oFile = new System.IO.FileInfo(sFile);
            if (oFile.Exists == true)
            {
                oStream = new System.IO.StreamReader(sFile);
                do
                {
                    sLine = oStream.ReadLine();
                    if ((sLine == null))
                    break;
                    listBox1.Items.Add(sLine);
                } while (true);
                oStream.Close();
                if (listBox1.Items.Count == 0)
                {
                }
                else
                {
                    button6.Enabled = true;
                    button9.Enabled = true;
                    button10.Enabled = true;
                }
            }					

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System.IO.StreamWriter oStream = null;
int i = 0;
oStream = new System.IO.StreamWriter(sFile);					

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System.IO.StreamWriter oStream = new System.IO.StreamWriter(sFile);
int i = 0;					

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while(i < listBox1.Items.Count)
{
    oStream.WriteLine(listBox1.Items[i]);
    i = i + 1 ;
}					

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for(int i=0; i<listBox1.Items.Count;i++)
{
    oStream.WriteLine(listBox1.Items[i]);
}					

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                if (listBox1.Items.Count == 0)
                {
                }
                else
                {
                    button6.Enabled = true;
                    button9.Enabled = true;
                    button10.Enabled = true;
                }					

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                if (listBox1.Items.Count != 0)
                {
                    button6.Enabled = true;
                    button9.Enabled = true;
                    button10.Enabled = true;
                }					

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private void LoadFiles()
        {
            DirectoryInfo dir = null;
            // do not use this, if u know the directory.
            // use DirectoryInfo dir = new DirectoryInfo(yourdirpath); instead
            FolderBrowserDialog dialog = new FolderBrowserDialog();
            if (dialog.ShowDialog() == DialogResult.OK)
                dir = new DirectoryInfo(dialog.SelectedPath);
            else
                return;
            //*
            var files = dir.GetFiles("*.exe", SearchOption.AllDirectories);
            foreach (var file in files)
                listBox.Items.Add(new ListEntry(file.FullName, file.Name));
        }
        private void Execute()
        {
            string file = ((ListEntry)listBox.SelectedItem).FileName;
            Process.Start(file);
        }