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Returns the width in inches of the paper, considered page orientation.
If a custom paper size is set by CustomPaperSize(double, double), this property returns the configured paper width.
double PaperWidth { get; }
ReadOnly Property PaperWidth As Double
IPageSetup pageSetup = worksheet.PageSetup;
pageSetup.CustomPaperSize(8.5, 13);
double paperWidth = pageSetup.PaperWidth;