PDFsharp & MigraDoc Foundation

Hi All,

I am new to PDFSharp. I am changing the subject of an existing pdf(already created in photoshop 7) using pdfsharp 1.3 in c#(VS2008). The code I am using is:

PdfDocument pdoc = PdfReader.Open(Filename);
pdoc.Info.Subject = "new subject";
pdoc.Save(Filename);
pdoc.Close();
pdoc.Dispose();

After that, the subject has been changed but the file is not opened in the photoshop. I am able to open the file in acrobat but also want to open it in photoshop.

Is the file created or modified using PDFSharp not opened with photoshop or am I missing something?

Thanks