Vista - PaperSize not available when Run as Admin

I've got a Windows app written in C# that errors out when it is Run as Admin. I've boiled it down to setting the PaperSize on the printer. I've got a test app consisting of single form with two textboxes and in the Shown event I have the following code:

PrinterSettings ps = new PrinterSettings();
ps.PrinterName = "Microsoft XPS Document Writer";
textBox1.Text = ps.PrinterName;
textBox2.Text = ps.PaperSizes.Count.ToString();

When I run the app with a double click on the desktop icon I get the expected 106 for the count. If I right click the icon and select Run as Admin, the printer name is correct but the count is zero.

Part of my full app relies on reading the PaperSizes so the issue of not finding any when running as admin is causing some problems. This only seems to be an issue on 64 bit Vista. Have reproduced it on two 64 bit boxes but don't have the problem on a 32 bit Vista or XP 32 or XP 64.

Any help on this would be greatly appreciated

Thanks

is this a 32bit application?

--
Alan Morris
Windows Printing Team
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"robkeithd" <guest@xxxxxx-email.com> wrote in message
news:e3a413d48d7036ec60340f977026c0f9@xxxxxx-gateway.com...

Hi Alan,

Thanks for the reply

Our "real" app is 32 bit. I built the test app as both 32 and 64. We have been done a little more discovery. This seems to have something to do with splwow64.exe. If I run the test "as is" and then it again "as admin" I have the problem. If I bring up Task Manager and kill splwow64 (or wait long enough for it go away on its own) in between then the test runs fine. If I run "as admin" the first time then I don't seem to have the problem - i.e. I can turn right around and run the app as is or as admin with no problem.

So now I'm at the point where I know I need to make sure I can read the printer properties before proceeeding with the print job so my program won't just flat out die but I don't really know what to do if it turns out that I can't read the properites.

If there is some trick or tip out there it would be greatly appreiciated.