background image not show in pdf

Question

i am creating string builder table and set background image of table now when i print the table to pdf background image not display in pdf why??/

 

 here i set image:-

sb.Append("");

 

 

and here print the table:-

StringReader sr = new StringReader(sb.ToString());

string path = "C:\\Users\\Archit\\Desktop\\test.pdf";

StringWriter sw = new StringWriter();

var output = new FileStream(path, FileMode.Create);

iTextSharp.text.Document pdfDoc = new iTextSharp.text.Document(PageSize.A4, 10F, 10F, 10F, 0F);

HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

iTextSharp.text.pdf.PdfWriter.GetInstance(pdfDoc, output);

pdfDoc.Open();

htmlparser.Parse(sr);

pdfDoc.Close();

//Location = Location +400;