Key cannot be null and append

Hi

When im trying to append a pdf i get an "Key cannot be null" when is trying to append a document for third time

Sample Code
for (int i = 0; i < records.Count; i++)
{
Response.Write(records[i].ToString() + "
");
WebClient objClient = new WebClient();


if (records[i].ToString().ToLower().Contains (".pdf"))
{
byte[] myhtmlrequest = objClient.DownloadData(records[i].ToString());
PdfLoadedDocument lDoc = new PdfLoadedDocument(myhtmlrequest);
page = lDoc.Pages.Add() as PdfPage;
g = page.Graphics;
text ="Document Number="+ i.ToString ();
g.DrawString(text, font, PdfBrushes.Black, PointF.Empty);
doc.Append(lDoc);



}


}

Hi,

Thank you for choosing Syncfusion products.

I am afraid that I was not able to reproduce the issue. Kindly look into the sample from the below specified link:

http://www.syncfusion.com/support/user/uploads/Pdf_Web_76467_dde1cd93.zip

Could you please update me the below questions so that we could sort out the cause of the issue and provide you a solution?

1) Could you please send us the reproducing steps with the couple of PDF files.
2) Please let me know, Which version you are using now?

Please let me know if I misunderstand your requirement.

Regards,
Suba