When I single step through the code below, it sends back the PDF file that 
is retrieved in the line fm.GetAccountPDF(...).  When I run without single 
stepping, I get the master page for this page.  I have actually saved the 
file returned by IE 7 as a text file and opened it in notepad, so I have 
confirmed that it is indeed the page master being returned.  The code is in 
the code behind file for the aspx page and is called directly from a link on 
the page.  In all cases, the PDF file is correctly created on the server and 
I can open it directly from Windows Explorer.  This code is actually 
slightly modified from the code in MS TechNet article 812406 
http://support.microsoft.com/kb/812406/en-us.

What am I doing wrong?

Thanks,
Mike Ober.


protected void StreamFile(object sender, EventArgs e)
{
  const int ChunkSize = 8192; // Use a cluster size multiple for performance
  FileManager fm = null;
  System.IO.Stream iStream = null;
  try {
    fm = new FileManager((ASPNET2VAX.Core)Session["vax"]);
    try {
      System.IO.FileInfo fiPDF = 
fm.GetAccountPDF(Request.QueryString["id"]);
      // Total bytes to read:
      long dataToRead = fiPDF.Length;
      Response.Clear();
      Response.AppendHeader("Content-Disposition", "attachment; filename=" + 
fiPDF.Name);
      Response.AppendHeader("Content-Length", dataToRead.ToString());
      Response.ContentType = 
ASPNET2VAX.SupportRoutines.LookupMIMEType(fiPDF);
      // Now write the file
      // Buffer to read sytes in chunks:
      byte[] buffer;
      // Length of the file:
      int length;
      // Open the file.
      iStream = new System.IO.FileStream(fiPDF.FullName,
                                                               System.IO.FileMode.Open,
                                                               System.IO.FileAccess.Read,
                                                               System.IO.FileShare.Read);
      // Read the bytes.
      while (dataToRead > 0) {
        // Verify that the client is connected.
        if (Response.IsClientConnected) {
          // Read the data in buffer.
          buffer = new byte[ChunkSize];
          length = iStream.Read(buffer, 0, ChunkSize);
          // Write the data to the current output stream.
          Response.OutputStream.Write(buffer, 0, length);
          // Flush the data to the HTML output.
          Response.Flush();
          // Update our position
          dataToRead = dataToRead - length;
        } else {
          //prevent infinite loop if user disconnects
          dataToRead = -1;
        }
      }
      Response.End();

    } catch (Exception ex) {
      hgc_outputMsg.InnerHtml += ex.Message;

    } finally {
      if (iStream != null) {
        iStream.Close();
      }
    }

  } catch {
    Response.Redirect(SingularityLibrary.config.CoreConfiguration.appPath(Request).ToString() 
+ "/" + Wakefield.Core.Config.WakefieldConfig.ClientLoginPage);
  }
}