C# 2 Fragen (Listview & DirectoryInfo)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;



namespace FileBrowser
{
    public partial class FileLister : UserControl
    {
        public FileLister()
        {
            InitializeComponent();
            PopulateTreeView();
            listView1.Columns.Add("Datei", 450);
            listView1.Columns.Add("Path");
            listView2.Columns.Add("Datei", 450);
            listView2.Columns.Add("Path");
        }       

        private void PopulateTreeView()
        {
            TreeNode rootNode;

            DirectoryInfo info = new DirectoryInfo(@"C:\"); // Hier gibts einen Fehler
            if (info.Exists)
            {
                rootNode = new TreeNode(info.Name);
                rootNode.Tag = info;
                GetDirectories(info.GetDirectories(), rootNode);
                treeView1.Nodes.Add(rootNode);
            }
        }

        private void GetDirectories(DirectoryInfo[] subDirs, TreeNode nodeToAddTo)
        {
            TreeNode aNode;
            DirectoryInfo[] subSubDirs;
            foreach (DirectoryInfo subDir in subDirs)
            {
                aNode = new TreeNode(subDir.Name, 0, 0);
                aNode.Tag = subDir;
                aNode.ImageKey = "folder";
                subSubDirs = subDir.GetDirectories();
                if (subSubDirs.Length != 0)
                {
                    GetDirectories(subSubDirs, aNode);
                }
                nodeToAddTo.Nodes.Add(aNode);
            }
        }

        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            int i=0;
            string[] seachfor = { "*.mp3", "*.flac", "*.wma", "*.wav", "*.ogg", "*.aac", "*.vbl", "*.cda", "*.nsa", "*.asf", "*.m3u", "*.m3u8", "*.pls", "*.b4s", "*wpl", "*.asx", "*."};
            TreeNode newSelected = e.Node;
            DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag;
            listView1.Items.Clear();
            listView1.Columns.Clear();

            while (i != seachfor.Length)
            {
                foreach (FileInfo file in nodeDirInfo.GetFiles(seachfor[i]))
                {
                    string[] filepath = { file.Name, file.FullName };
                    ListViewItem item1 = new ListViewItem(filepath);
                    this.listView1.Items.AddRange(new ListViewItem[] { item1 });
                }
                i++;
            }
            listView1.Columns.Add("Datei", 450);
            listView1.Columns.Add("Path");
        }

        private void AddFilesButton_Click(object sender, EventArgs e)
        {

        }

        private void ClearFilesButton_Click(object sender, EventArgs e)
        {

        }
    }
}

foreach (ListViewItem lvi in listview1.SelectedItems)
{
     ListViewItem newlvi = new ListViewItem();
     newlvi.Text = lvi.Text;
     foreach (ListViewItem.ListViewSubItem lvisub in lvi.subitems)
    {
        newlvi.subitems.add(lvisub.text);
    }
    listview2.items.add(newlvi);
}

 foreach (ListViewItem lvi in listView1.SelectedItems)
            {
                ListViewItem newlvi = new ListViewItem();
                newlvi.Text = lvi.Text;
                for (int i=1;i<lvi.SubItems.Count;i++)
                {
                    newlvi.SubItems.Add(lvi.SubItems[i].Text);
                }
                listView2.Items.Add(newlvi);
            }

 try
                {
                    subSubDirs = subDir.GetDirectories();
                    if (subSubDirs.Length != 0)
                    {
                        GetDirectories(subSubDirs);
                    }
                }
                catch { }
[CODE]

FileStream fs = new FileStream("Dateiname.ext",FileMode.Create);
StreamWriter sw = new StreamWriter(fs);

sw.WriteLine("Das was du schreiben willst");