private void button19_Click(object sender, System.EventArgs e)
{
C1.C1Pdf.C1PdfDocument pdf = new C1.C1Pdf.C1PdfDocument();
// set up to draw
Font font = new Font("Tahoma", 14);
RectangleF rc = new RectangleF(100, 100, 300, 28);
// measure RTF text and adjust the rectangle to fit
string text = @"Short {\b RTF} snippet with some {\b bold} and some {\i italics} in it.";
rc.Y = rc.Bottom + 12;
rc.Height = pdf.MeasureStringRtf(text, font, rc.Width).Height;
// render RTF snippet
pdf.DrawStringRtf(text, font, Brushes.Blue, rc);
pdf.DrawRectangle(Pens.Black, rc);
// save the document to a file
string fileName = tempdir + "rtf.pdf";
pdf.Save(fileName);
System.Diagnostics.Process.Start(fileName);
}