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Gets or sets the number of pages wide the worksheet will be scaled to when it's printed. Applies only to worksheets.
int FitToPagesWide { get; set; }
Property FitToPagesWide As Integer
IPageSetup pageSetup = worksheet.PageSetup;
pageSetup.IsPercentScale = false;
pageSetup.FitToPagesWide = 3;
int pagesWide = pageSetup.FitToPagesWide;