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 private void speichernUnterToolStripMenuItem_Click(object sender, EventArgs e)
        {
            String dateiname = "";

            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                dateiname = saveFileDialog1.FileName;

                // create a file stream
                System.IO.FileStream datenStrom = new System.IO.FileStream(dateiname, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write, System.IO.FileShare.ReadWrite);

                // create a stream writer
                System.IO.StreamWriter datenSchreiber = new System.IO.StreamWriter(datenStrom, System.Text.Encoding.ASCII);

                // write to file (buffer)
                datenSchreiber.Write(label14.Text + "\r\n" + label12.Text + "\r\n" + label13.Text + "\r\n" + label11.Text + "\r\n" + label1.Text);

                // flush buffer (so the text really goes into the file)
                datenSchreiber.Flush();

                // close stream writer and file
                datenSchreiber.Close(); datenStrom.Close();
            }
        }					

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namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                System.IO.FileStream wFile;
                byte[] byteData = null;
                byteData = Encoding.ASCII.GetBytes("FileStream Test");
                wFile = new FileStream("c:\\streamtest.txt", FileMode.Append);
                wFile.Write(byteData, 0, byteData.Length);
                wFile.Close();
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.ToString());
           }
        }
    }
}