Custom Page Size (Printing)

Hello all,

I am trying to make two printers (different make/model) use a custom page size. I have tried the code bellow (cut down for brevity).  On one of the printers, the code works and the resulting document is printed on the correct size paper, the other seems to want to use A4 size. I have popped up a message box just before calling Print with the contends of prnDoc.DefaultPageSettings.ToString(), this shows the custom page size settings are there.  Am I missing something, or is there a better way to do this? 

-- code -------------
PrintDocument prnDoc = new PrintDocument();
prnDoc.PrinterSettings.PrinterName = prnName;
prnDoc.DefaultPageSettings.PaperSize = new PaperSize("Custom page size.",                                                                         500, 900);
prnDoc.PrintPage += new PrintPageEventHandler(OnPrintPage);
prnDoc.Print();
---------------------

Thank you.

Regards,
Gary Harpin
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