[reflection.assembly]::loadfrom("C:\assemblies\PdfSharp.dll ") | out-null

Function Img2PDF {
   Param($img, $pdf)

   #  Create a new PDF document
   $document = new-object PdfSharp.Pdf.PdfDocument
   #  Create an empty page
   $page = $document.AddPage()
   
$page.Orientation

   #  Get an XGraphics object for drawing
   $gfx = [PdfSharp.Drawing.XGraphics]::FromPdfPage($page)
   
   #$image = New-Object PdfSharp.Drawing.XImage
   $image = [PdfSharp.Drawing.XImage]::FromFile($img)

   $gfx.DrawImage($image, 0, 0, $page.Width, $page.Height)

   #  Save the document...
   $document.Save($pdf)
}

Img2PDF -img c:\test\123.png -pdf c:\test\test123.pdf

$page.Orientation = $page.Orientation.Landscape

$page.Orientation = "Landscape"