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Excel and .net WebService issue

I have written a Web Service in C# using visual studio 2005. One of the functions is to generate reports using MS excel. The problem I have is the following.

While I am debugging the web service (running it directly from VS), the report generation works properly. If I publish the web service and run the report generation it fails with the following error.
"Unable to set the PrintTitleRows property of the PageSetup class".
I have made sure all of the Interop DLL's (e.g. Interop.Excel.dll etc) are copied to the remote web server as well as the same version of MS office being installed as on the development machine (2003 professional).

I have even installed VS2005 and debugged the application on the remote server. The report generation works when the Web Service is run from VS but failed when published.

As anyone got any idea as to what is going on here?

Sample of the code:
    Excel.ApplicationClass excelApp;
    Excel.Workbook newWorkbook;
    excelApp = new Excel.ApplicationClass();

    Excel._Worksheet oSheet;
    Excel.Range oRng;
    excelApp.Visible = false;
    newWorkbook = excelApp.Application.Workbooks.Add(Type.Missing);
    oSheet = (Excel._Worksheet)newWorkbook.ActiveSheet;
    oSheet.Name = RepFormat.ReportReference;
    oSheet.PageSetup.PrintTitleRows = "$1:$3";    // This line fails

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1 Solution
Rory ArchibaldCommented:
I suspect that the problem is that the account your service is running under does not have printers installed. As a result you cannot access anything to do with PageSetup.
WallaceAdrianAuthor Commented:
Hi Rory,
Your suggestion makes sense but I have just tried that but I get the same result.

I went in to the printer properties for the default printer. On the security tab, I added the NETWORK SERVICE account and gave all priveledges (Print, Manage printers & documents ...).
I also stopped and restarted the service.

Is this what you had in mind?

Rory ArchibaldCommented:
No - Office apps work on the basis that they are being run interactively with the desktop - i.e. you are logged in as the account they are running as. If the *profile* for the account that is running the service does not have an installed printer, then you cannot access the PageSetup properties. If your service is running as a network/system account, then it does not have a profile or any installed printers. Can you run it as a user account?
PS You may wish to review this article: http://support.microsoft.com/?id=257757
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