Where to find the data changed by PageSetupDialog

[Just Me]

I do the code at the bottom of this, and later use:
zz = mPD.DefaultPageSettings.PaperSize.Height
and it works most of the time. It's a long story but if I use the
printer's "Custom" size I do not always get the correct results.

Expertimenting isn't getting me anywhere I need someone who
understands the mPD options!

I know I can also get page size by
zz = mpD.PrinterSettings.DefaultPageSettings.PaperSize. Height
Which is the one to use??

All pages in the document use the same settings.
Where should I look for the page sizes and Dpi
set by PageSetupDialog and where should I set margins.

I'd appreciate any info,

PS
Wordpad handles the "Custom" sizes for the printer OK
so it isn't the driver.
Dim lPageSetupDialog As New PageSetupDialog
With lPageSetupDialog
..Document = mPD
..ShowHelp = False
..AllowPaper = True
..AllowMargins = True
..AllowOrientation = True
..AllowPrinter = True
..PageSettings.Margins.Top = 100 * GDI.CSingle(TextBoxTopMargin.Text)
..PageSettings.Margins.Left = 100 * GDI.CSingle(TextBoxLeftMargin.Text)
..PageSettings.Margins.Right = 100 * GDI.CSingle(TextBoxRightMargin.Text)
..PageSettings.Margins.Bottom = 100 * GDI.CSingle(TextBoxBottomMargin.Text)
If .ShowDialog() <> DialogResult.OK Then Exit Sub