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Stream myStream;
SaveFileDialog saveFileDialog1 = new SaveFileDialog();

saveFileDialog1.Filter = ".bmp files (*.bmp)|*.bmp| txt files (*.txt)|*.txt";
saveFileDialog1.FilterIndex = 2;
saveFileDialog1.InitialDirectory = this.standardPfad;

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
    if ((myStream = saveFileDialog1.OpenFile()) != null)
    {
        StreamWriter wText = new StreamWriter(myStream);
        if (saveFileDialog1.Filter == ".bmp files (*.bmp)|*.bmp")
        {
            pbAusgabe.Image.Save(saveFileDialog1.FileName);
        }
        else
        {
            wText.Write(rtbEingabe.Text);
        }
        wText.Flush();
        myStream.Close();
    }
}