protected void ExportToPDFWithFormatting()
{
        PdfPTable table = null; 

        int colCount = gvProducts.Columns.Count;

        table = new PdfPTable(colCount);
        table.HorizontalAlignment = 1;
        table.WidthPercentage = 100;

        int[] colWidths = new int[gvProducts.Columns.Count];

        PdfPCell cell;
        string cellText;

        for (int colIndex = 0; colIndex < colCount; colIndex++)
        {

            colWidths[colIndex] = (int)gvProducts.Columns[colIndex].ItemStyle.Width.Value;
            cellText = Server.HtmlDecode(gvProducts.HeaderRow.Cells[colIndex].Text);

            BaseFont bf = BaseFont.CreateFont(
                                    BaseFont.HELVETICA,
                                    BaseFont.CP1252,
                                    BaseFont.EMBEDDED,
                                    false);

            iTextSharp.text.Font font = new iTextSharp.text.Font(bf, 10, iTextSharp.text.Font.BOLD, BaseColor.WHITE);
            cell = new PdfPCell(new Phrase(cellText.Replace("<br />", Environment.NewLine), font));

            cell.HorizontalAlignment = Element.ALIGN_CENTER;
            cell.VerticalAlignment = Element.ALIGN_MIDDLE;
            cell.FixedHeight = 55f;

            cell.BackgroundColor = new BaseColor(System.Drawing.ColorTranslator.FromHtml("#a52a2a"));

            table.AddCell(cell);
        }


        for (int rowIndex = 0; rowIndex < gvProducts.Rows.Count; rowIndex++)
        {
            if (gvProducts.Rows[rowIndex].RowType == DataControlRowType.DataRow)
            {
                for (int j = 0; j < gvProducts.Columns.Count; j++)
                {

                   if (j == 10)
                   {

                       cellText = (gvProducts.Rows[rowIndex].Cells[10].FindControl("img") as HyperLink).NavigateUrl;
                       string imagePath = Server.MapPath((gvProducts.Rows[rowIndex].Cells[10].FindControl("img") as HyperLink).ImageUrl);
                       iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imagePath);
                       Chunk cImage = new Chunk(image, 0, 0, false);
                       Anchor anchor = new Anchor(cImage);
                       anchor.Reference = cellText.ToString();
                       table.AddCell(anchor);

                   }
                   else
                   {
                      cellText = Server.HtmlDecode(gvProducts.Rows[rowIndex].Cells[j].Text);
                   }

                      cell = new PdfPCell(new Phrase(cellText, FontFactory.GetFont("PrepareForExport", 8)));                  
                      cell.HorizontalAlignment = Element.ALIGN_CENTER;
                      cell.VerticalAlignment = Element.ALIGN_MIDDLE;
                      cell.FixedHeight = 25f;
                      table.AddCell(cell);

                }
            }
        }

    Document pdfDoc = new Document(PageSize.A3.Rotate(), 30f, 30f, 30f, 0f);

    PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

    pdfDoc.Open();
    table.HeaderRows = 1;

    iTextSharp.text.Font fdefault = FontFactory.GetFont("Verdana", 18, iTextSharp.text.Font.BOLD, BaseColor.BLUE);

    string s;
    s = "Test Export";

    pdfDoc.Add(new Paragraph(s, fdefault));
    pdfDoc.Add(table);

    pdfDoc.Close();

    Response.ContentType = "application/pdf";
    Response.AddHeader("content-disposition", "attachment;" + "filename=" + DateTime.Now + ".pdf");
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.Write(pdfDoc);
    Response.End();

}
.aspx

                                <%--Start 10--%>
                                <asp:TemplateField HeaderText="attached" ItemStyle-HorizontalAlign="Center">
                                    <ItemTemplate>
                                        <asp:HyperLink ID="img" runat="server" NavigateUrl='<%# Eval("attached").ToString() %>'
                                            ImageUrl='<%#(String.IsNullOrEmpty(Eval("attached").ToString()) ? "/Images/cross-button.png" : "/Images/download.gif")%>'
                                            ToolTip='<%#(String.IsNullOrEmpty(Eval("attached").ToString()) ? "No available" : "Available")%>'
                                            Target="_blank" BorderStyle="None" ForeColor="Transparent">
                                        </asp:HyperLink>
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <%--End 10--%>