I am using following code:
StringBuilder s = new StringBuilder();
//test aspx = new test();
StringWriter sw = new StringWriter(s);
HtmlTextWriter writer = new Html32TextWriter(sw);
base.Render(writer);

System.IO.Stream stream = new System.IO.FileStream(@"C:\new_pdf_name6.pdf", FileMode.OpenOrCreate);
Pdfizer.HtmlToPdfConverter htmlToPdf = new Pdfizer.HtmlToPdfConverter();
// open stream to write Pdf to to
htmlToPdf.Open(stream);
// write the HTML to the component
htmlToPdf.Run(s.ToString());
// close the write operation and complete the PDF file
htmlToPdf.Close();

This is giving following error on this statement:
htmlToPdf.Run(s.ToString());

Error is: The remote server returned an error: (503) Server Unavailable.

Please help