private PageRotate PageRotation(PdfPage pdfPage)
{
	int rot = pdfPage.Rotation - pdfPage.OriginalRotation;
	if (rot < 0)
		rot = 4 + rot;
	return (PageRotate)rot;
}

private SizeF GetRenderSize(Size pageSize, Size fitSize)
{
	double w, h;
	w = pageSize.Width;
	h = pageSize.Height;

	double nh = fitSize.Height;
	double nw = w * nh / h;
	if (nw > fitSize.Width)
	{
		nw = fitSize.Width;
		nh = h * nw / w;
	}
	return new SizeF((float)nw, (float)nh);
}

/// <summary>
/// Occurs when the Print button is clicked
/// </summary>
/// <param name="item">The item that has been clicked</param>
protected virtual void OnPrintClick(ToolStripButton item)
{
	//Set up PrintDocument object
	PrintDocument pd = new PrintDocument();
	pd.PrinterSettings.MinimumPage = 1;
	pd.PrinterSettings.MaximumPage = PdfViewer.Document.Pages.Count;
	pd.PrinterSettings.FromPage = pd.PrinterSettings.MinimumPage;
	pd.PrinterSettings.ToPage = pd.PrinterSettings.MaximumPage;
	int pageForPrint = 0;

	pd.BeginPrint += (s, e) => 
	{
		//Calculate range of pages for print
		switch(pd.PrinterSettings.PrintRange)
		{
			case PrintRange.Selection:
			case PrintRange.CurrentPage: //Curent page
				pd.PrinterSettings.FromPage = PdfViewer.Document.Pages.CurrentIndex+1;
				pd.PrinterSettings.ToPage = PdfViewer.Document.Pages.CurrentIndex+1;
				break;
			case PrintRange.SomePages: //The range specified by the user
				break;
			default: //All pages
				pd.PrinterSettings.FromPage = pd.PrinterSettings.MinimumPage;
				pd.PrinterSettings.ToPage = pd.PrinterSettings.MaximumPage;
				break;
		}

		pageForPrint = pd.PrinterSettings.FromPage-1;
	};

	pd.QueryPageSettings += (s, e) =>
	{
		//Set the paper orientation to Landscape if the page is rotated
		e.PageSettings.Landscape = pd.PrinterSettings.DefaultPageSettings.Landscape;
		if ((PdfViewer.Document.Pages[pageForPrint].Rotation == PageRotate.Rotate270
			|| PdfViewer.Document.Pages[pageForPrint].Rotation == PageRotate.Rotate90
			))
			e.PageSettings.Landscape = true;
	};

	pd.PrintPage += (s, e) =>
	{
		//Calculate the size of the printable area in pixels
		var fitSize = new Size(
			(int)(e.Graphics.DpiX * e.PageSettings.PrintableArea.Width / 100),
			(int)(e.Graphics.DpiY * e.PageSettings.PrintableArea.Height / 100)
			);
		//Get page's size
		var pageSize = new Size(
			(int)PdfViewer.Document.Pages[pageForPrint].Width / 72.0f * e.Graphics.DpiX, 
			(int)PdfViewer.Document.Pages[pageForPrint].Height / 72.0f * e.Graphics.DpiY);

		//If page was rotated in original file, then we need to "rotate the paper in printer". 
		//For that just swap the width and height of the paper.
		if (PdfViewer.Document.Pages[pageForPrint].OriginalRotation == PageRotate.Rotate270
			|| PdfViewer.Document.Pages[pageForPrint].OriginalRotation == PageRotate.Rotate90)
			fitSize = new Size(fitSize.Height, fitSize.Width);

		//Calculate the page's size fitted to the paper's size.  
		var rSize = GetRenderSize(pageSize, fitSize);

		using (PdfBitmap bmp = new PdfBitmap((int)rSize.Width, (int)rSize.Height, true))
		{
			//Render to PdfBitmap using page's Render method with FPDF_PRINTING flag.
			PdfViewer.Document.Pages[pageForPrint].Render
				(bmp,
				0,
				0,
				(int)rSize.Width,
				(int)rSize.Height,
				PageRotate.Normal,
				RenderFlags.FPDF_PRINTING | RenderFlags.FPDF_ANNOT);

			//Rotates the PdfBitmap image depending on the orientation of the page
			if (PageRotation(PdfViewer.Document.Pages[pageForPrint]) == PageRotate.Rotate270)
				bmp.Image.RotateFlip(System.Drawing.RotateFlipType.Rotate270FlipNone);
			else if (PageRotation(PdfViewer.Document.Pages[pageForPrint]) == PageRotate.Rotate180)
				bmp.Image.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
			else if (PageRotation(PdfViewer.Document.Pages[pageForPrint]) == PageRotate.Rotate90)
				bmp.Image.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipNone);

			//Set DPI of the image same as the printer's DPI
			(bmp.Image as Bitmap).SetResolution(e.Graphics.DpiX, e.Graphics.DpiY);
			//Draw rendered image to printer's graphics surface
			e.Graphics.DrawImageUnscaled(bmp.Image, 0, 0);
		}

		//Print next page
		if (pageForPrint < pd.PrinterSettings.ToPage-1)
		{
			pageForPrint++;
			e.HasMorePages = true;
		}

	};

	//Show standard print dilog
	var dlg = new PrintDialog();
	dlg.AllowCurrentPage = true;
	dlg.AllowSomePages = true;
	dlg.UseEXDialog = true;
	dlg.Document = pd;
	if(dlg.ShowDialog()== DialogResult.OK)
	{
		pd.Print();
	}
}

private PageRotate PageRotation(PdfPage pdfPage)
{
	int rot = pdfPage.Rotation - pdfPage.OriginalRotation;
	if (rot < 0)
		rot = 4 + rot;
	return (PageRotate)rot;
}

private SizeF GetRenderSize(Size pageSize, Size fitSize)
{
	double w, h;
	w = pageSize.Width;
	h = pageSize.Height;

	double nh = fitSize.Height;
	double nw = w * nh / h;
	if (nw > fitSize.Width)
	{
		nw = fitSize.Width;
		nh = h * nw / w;
	}
	return new SizeF((float)nw, (float)nh);
}

var doc = PdfDocument.Load("c:\test.pdf");
var printDoc = new PdfPrintDocument(doc);
printDoc.Print();

var doc = PdfDocument.Load("c:\test.pdf");
var printDoc = new PdfPrintDocument(doc);
PrintController printController = new StandardPrintController();
printDoc.PrintController = printController;
printDoc.Print();

public void OnPrintClick()
{
	if (PdfViewer.Document.FormFill != null)
		PdfViewer.Document.FormFill.ForceToKillFocus();

	//create an instance of PrintDocument class
	var printDoc = new PdfPrintDocument(PdfViewer.Document);

	//Create a standard print dialog box
	var dlg = new PrintDialog();
	dlg.AllowCurrentPage = true;
	dlg.AllowSomePages = true;
	dlg.UseEXDialog = true;
	//sets the PrintDocument used to obtain PrinterSettings.
	dlg.Document = printDoc;
	//show PrinterDialog and print pdf document
	if (dlg.ShowDialog() == DialogResult.OK)
		printDoc.Print();
}