如何调用PPT com设置打印为横向打印

Question

我想批量打印PPT文件，然后按照自己所设置的板式打印，现在可以设置一页多张。
但是总是纵向打印的，怎么设置成横向打印？？？？
效果为：PPT.Application pa = new PPT.Application();
            PPT.Presentation ps = pa.Presentations.Open(@"e:\\货币危机.pptx",
                                  Microsoft.Office.Core.MsoTriState.msoCTrue,
                                  Microsoft.Office.Core.MsoTriState.msoCTrue,
                                  Microsoft.Office.Core.MsoTriState.msoFalse);
            ps.PrintOptions.OutputType = PPT.PpPrintOutputType.ppPrintOutputFourSlideHandouts;
            ps.PrintOptions.HandoutOrder = PPT.PpPrintHandoutOrder.ppPrintHandoutHorizontalFirst;
            ps.PrintOptions.FitToPage = Microsoft.Office.Core.MsoTriState.msoCTrue;
            ps.PrintOptions.FrameSlides = Microsoft.Office.Core.MsoTriState.msoCTrue;
            ps.PrintOut();PPT打印c#com