Project project = new Project("New Project.mpp");

PrintOptions options = new PrintOptions();
options.Timescale = Timescale.Months;

// Print first two pages
PrinterSettings printerSettings = new PrinterSettings();
printerSettings.PrintRange = PrintRange.SomePages;
printerSettings.FromPage = 1;
printerSettings.ToPage = 2;

System.Drawing.Printing.PageSettings pageSettings = printerSettings.DefaultPageSettings;
pageSettings.PaperSize = new PaperSize("Custom Size", 1000, 700);
project.Print(printerSettings, options);