@amjad.sahi, @Professionalize.Discourse, @John.He, @simon.zhao
worksheet.PageSetup.PaperSize = PaperSizeType.Custom;
// Set custom paper size for A1 (width: 33.1 inches, height: 23.4 inches)
worksheet.PageSetup.Custom…...paper size of Worksheet for rendering, please refer to the following...Paper Size of Worksheet for Rendering This article explains how...