iTextsharp PDF Cannot open when hosting in IIS

See more:

C#

ASP.NET

PDF

itextsharp

Hi,

I am using iTextSharp for creating PDF for reports in ASP.Net (c#).
Pdf is created successfully & can be opened when running the Application, but when iam hosted in IIS it cannot open in PDF and gives error :

"adobe reader could not open pdf because it is either not a supported file type or because the file has been damaged "

My code like:

            Document pdfDoc = new Document();
            pdfDoc.SetPageSize(PageSize.A4.Rotate());

            string filepath = "Demo" + ".pdf";

            string attachment = "attachment; filename=" + filepath;
            Response.Charset = String.Empty;
            Response.ClearContent();
            Response.AddHeader("content-disposition", attachment);
            Response.ContentType = "application/PDF";

            PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
 
            pdfDoc.Open();

            //Adding some paragraph in to the pdfdoc.            

            pdfDoc.Close();

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

Please help me!!

I am waiting for your greatfull ideas !