How to create a PDF document with different page orientation

  
//Initialize the PDF document.
PdfDocument document = new PdfDocument();
PdfPage page = null;   
//Initialize the TrueTypeFont.
PdfFont font = new PdfTrueTypeFont(new Font("Arial", 20f, FontStyle.Regular), false);      
for (int i = 1; i < 11; i++)
{               
if (i % 2 != 0)
{ 
//Set the Orientation to Page.
document.PageSettings.Orientation = PdfPageOrientation.Portrait;
//Add the pages to PDF document.
page = document.Pages.Add();       
//Draw the String.
page.Graphics.DrawString("Portrait", font, PdfBrushes.Black, new PointF(0, 0));
}
else
{
//Set the Orientation to Page.
 document.PageSettings.Orientation = PdfPageOrientation.Landscape;
//Add the pages to PDF document.
 page = document.Pages.Add();   
//Draw the String.               
 page.Graphics.DrawString("Landscape", font, PdfBrushes.Black, new PointF(0, 0));
}
}
//Save the PDF document.
document.Save("Orientation.pdf");
//Close the PDF document.
document.Close(true);