Hi 
 i want to create box in header row in  PDF like that and i had write code
PdfPTable ClaimaintHeader = new PdfPTable(3);
                PdfPCell OurReferenceHeader = new PdfPCell(new Phrase("Our Ref", _font10BoldBlack));
                PdfPCell Claimant = new PdfPCell(new Phrase("Claimant", _font10BoldBlack));
                PdfPCell ClaiminigFor = new PdfPCell(new Phrase("Claiming For", _font10BoldBlack));
                OurReferenceHeader.BorderColor = iTextSharp.text.BaseColor.BLACK;
                Claimant.BorderColor = iTextSharp.text.BaseColor.BLACK;
                ClaiminigFor.BorderColor = iTextSharp.text.BaseColor.BLACK;
                OurReferenceHeader.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.Color.LightGray);
                Claimant.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.Color.LightGray);
                ClaiminigFor.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.Color.LightGray);
                OurReferenceHeader.HorizontalAlignment = Element.ALIGN_LEFT;
                Claimant.HorizontalAlignment = Element.ALIGN_LEFT;
                ClaiminigFor.HorizontalAlignment = Element.ALIGN_LEFT;