Error while converting gridview into pdf format using iTextsharp - c#

I am having gridview in which in few records it has image and in few records it didn't have image which gives error while converting it to pdf format.This code works fine if each row have images but not in case if any record didn't have image. Can anyone suggest me what to do with code so that my error can be resolve
here is my code:
protected void Button1_Click(object sender, EventArgs e)
{
grdview();
string file = "testc" + ".pdf";
string attachment = string.Format("attachment;filename={0}", file);
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/pdf";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
Panel1.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
iTextSharp.text.Document pdfdoc = new iTextSharp.text.Document();
pdfdoc.SetMargins(0f, 0f, 0f, 0f);
pdfdoc.SetPageSize(iTextSharp.text.PageSize.A2);
HTMLWorker htmlparser = new HTMLWorker(pdfdoc);
PdfWriter.GetInstance(pdfdoc, Response.OutputStream);
pdfdoc.Open();
htmlparser.Parse(sr);
pdfdoc.Close();
Response.Write(pdfdoc);
Response.End();
}
Image what error appears while conversion

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If you don't
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You will have to use 3rd party control for that
Try using iText Sharp library its free
for more info go here

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