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private void SaveChapterTSMI_Click(object sender, EventArgs e)
      {
       int whichTab = MainTC.SelectedIndex;
       String tabname = MainTC.SelectedIndex.ToString();
       SaveFileDialog save = new SaveFileDialog();
       save.Filter = "TPWriter Kapitel| *.tpwch";
       save.Title = "Kapitel " + tabname + " speichern";
       save.ShowDialog();
       String filename = "";
}					

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// Datei und Pfad erstellen
String s_dateiname = "C:\\Temp\\Test.txt";
// Filestreams erstellen
FileStream fs_datei = null;
StreamWriter sw_datei = null;
// Dateiinhalt erstellen
String s_dateiinhalt = "Hallo allerseits";
// Daten in Stream einlesen
StringBuilder sb = new StringBuilder();
sb.Append(s_dateiinhalt);
// Datei mit Inhalt fuellen und Datei erstellen
try
{
    fs_datei = new FileStream(s_dateiname, FileMode.Create);
    sw_datei = new StreamWriter(fs_datei);

    sw_datei.WriteLine("{0}", sb);
}
catch (Exception ew)
{
    Console.WriteLine("Exception: " + Convert.ToString(ew.Message));
}
finally
{
    if (sw_datei != null)
        sw_datei.Close();
}					

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private void addChapter()
        {
            int TabNumber = MainTC.SelectedIndex;
            TabNumber = MainTC.TabCount + 1;
            TabPage tabnew = new System.Windows.Forms.TabPage();
            tabnew.Text = "Neues Kapitel " + TabNumber;
            RichTextBox MainRTB = new System.Windows.Forms.RichTextBox();
            MainRTB.Name = "MainRTB";
            MainRTB.Multiline = true;
            MainRTB.AcceptsTab = true;
            MainRTB.ScrollBars = System.Windows.Forms.RichTextBoxScrollBars.Vertical;
            MainRTB.WordWrap = false;
            MainTC.Controls.Add(tabnew);
            tabnew.Controls.Add(MainRTB);
            MainRTB.Dock = DockStyle.Fill;
        }					

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private void tsbOpen_Click(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();
            open.FilterIndex = 1;
            open.InitialDirectory = System.Environment.GetFolderPath(Environment.SpecialFolder.CommonDocuments);
            open.Multiselect = false;
            open.RestoreDirectory = true;
            if (DialogResult.OK == open.ShowDialog())
            {
                fopen(open.FileName);
            }
        }

        public void fopen(String filename)
        {
            if (filename != "")
            {
                System.IO.StreamReader read = new System.IO.StreamReader(filename);
                if (MainTC.SelectedIndex == 0 && MainRTB.Text == "")
                {
                    while (!read.EndOfStream)
                    {
                        MainRTB.Text += read.ReadLine();
                    }
                }
                else
                {
                    addChapter();
                    MainTC.SelectedIndex += 1;
                    MainTC.SelectedTab.Focus();
                    while (!read.EndOfStream)
                    {
                        this.MainRTB.Text += read.ReadLine();
                    }
                }
            }
        }					

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while (!read.EndOfStream)
{
    foreach (TabPage t in tabControl1.TabPages)
    {
        if (t.Name.ToString() == "")
        {
            foreach (Control c in t.Controls)
            {
                if (c.Name.ToString() == "MainRTB")
                {
                    c.Text += read.ReadLine();
                }
            }
                                
        }
    }
}