Image extracted from grid view to PDF is too big

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Gridview

PDF

C#5.0

extract

Hi, I wanted to extract value from a grid view and post it on to a PDF. Everything is working except the image extracted from the grid view is always too big.
For eg:
There is 4 columns in the grid view. The 2 column would be the image. It would always overlap with the other 2 columns.

Code for gridview:

<asp:GridView ID="gv_CartProduct" runat="server" AutoGenerateColumns="False" onRowCommand="gv_CartProduct_OnRowCommand" >
            <Columns>
            <asp:TemplateField HeaderText="Title">
                <ItemTemplate>
                    <asp:Label ID="lbl_title" Text='<%# Eval("title") %>' runat="server"></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
               <asp:TemplateField HeaderText="Image">
                        <ItemTemplate>
                            <asp:Image ID="imgPreview" ImageUrl='<%# Eval("image", GetUrl("{0}"))  %>' runat="server"
                                Height="80px" Width="80px" />
                        </ItemTemplate>
                    </asp:TemplateField>

            <asp:BoundField DataField="price" HeaderText="Price" />
           <asp:TemplateField HeaderText="Quantity">
           <ItemTemplate>
                <asp:Label ID="lbl_quantity" runat="server"  Text='<%# Eval("qty") %>' CommandArgument='<%# Eval("title")%>' ></asp:Label>
            </ItemTemplate>
             </asp:TemplateField>
         </Columns>
         </asp:GridView>

Code for PDF extraction:

private void ExportGridToPDF()
               {
                   username = (string)(Session["username"]);
                   Response.ContentType = "application/pdf";
                   Response.AddHeader("content-disposition", "attachment;filename=" + username + "'s Purchase.pdf");
                   Response.Cache.SetCacheability(HttpCacheability.NoCache);
                   StringWriter sw = new StringWriter();
                   HtmlTextWriter hw = new HtmlTextWriter(sw);
                   //gv_CartProduct.DataBind();
                   gv_CartProduct.RenderControl(hw);
                   gv_CartProduct.HeaderRow.Style.Add("width", "15%");
                   gv_CartProduct.HeaderRow.Style.Add("font-size", "10px");
                   gv_CartProduct.Style.Add("text-decoration", "none");
                   gv_CartProduct.Style.Add("font-family", "Arial, Helvetica, sans-serif;");
                   gv_CartProduct.Style.Add("font-size", "8px");


                   StringReader sr = new StringReader(sw.ToString());
                   string str = "<h1 title=’Header’ align=’Center’> Thank You " +  username + ", for shopping at ShopNow</h1><br><table align=’Center’><tr><td style=’width:100px;color:green’> You have made successful payment at ShopNow online shop. Please keep this invoice. Thank You</td></tr></table>";
                   StringReader sr1 = new StringReader(str);
                   Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
                   HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                   PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
                   pdfDoc.Open();
                   htmlparser.Parse(sr1);
                   htmlparser.Parse(sr);
                   ConfirmPurchase();


                   pdfDoc.Close();
                   Response.Write(pdfDoc);
                   Response.End();
               }