RichTextBox temphotfix = new RichTextBox();
            temphotfix.Font = new Font(temphotfix.Font.Name, 14);
            System.Windows.Documents.TextRange range = new System.Windows.Documents.TextRange(omschrijving.Document.ContentStart, omschrijving.Document.ContentEnd);
            temphotfix.Text = omschrijving_temp;
            string temp = temphotfix.Rtf;
            byte[] byteArray = Encoding.ASCII.GetBytes(temp);
            MemoryStream stream = new MemoryStream(byteArray);
            range.Load(stream, DataFormats.Rtf);