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public partial class Konfiguration : Form
    {
        public string m_path;
        public Konfiguration()
        {
            InitializeComponent();
            txt_path.Text = m_path;
        }

        private void btn_ok_Click(object sender, EventArgs e)
        {
            setPfad(txt_path.Text);
            this.DialogResult = DialogResult.OK;
        }

        private void btn_abort_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.Abort;
        }

        public void setPfad(string path)
        {
            txt_path.Text = path;
        }

        public string getPfad()
        {
            return txt_path.Text;
        }
    }                    

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public partial class Hauptformular : Form
    {
        public string m_path;
        private System.Windows.Forms.TreeView treeDir;

        string substringDirectory;
        string substringFile;

        public Hauptformular()
        {
            InitializeComponent();
            treeDir.Nodes.Clear();
            m_path = @"C:\Dokumente und Einstellungen\bam\Eigene Dateien";
            treeDir.Nodes.Add(m_path);
            ErstelleDirTreeviewDir(m_path, treeDir.Nodes[0]);

            treeDir.AllowDrop = true;
            treeFile.AllowDrop = true;
        }