How to Convert PDF to TIFF in Visual Basic.NET?

Imports System.Drawing
Imports System.Drawing.Imaging
Imports PQScan.PDFToImage

Namespace PDF2TIFF
  Class Program
    Private Shared Sub Main(args As String())
      ' Create an instance of PQScan.PDFToImage.PDFDocument object.
      Dim pdfDoc As New PDFDocument()

      ' Load PDF document.
      pdfDoc.LoadPDF("sample.pdf")

      'Get total page count.
      Dim count As Integer = pdfDoc.PageCount

      For i As Integer = 0 To count - 1
        'Convert page to image
        Dim tifImage As Bitmap = pdfDoc.ToImage(i)
        'Save image with tiff file type
        tifImage.Save("output" & i & ".tiff", ImageFormat.Tiff)
      Next
    End Sub
  End Class
End Namespace

Imports System.IO
Imports System.Drawing
Imports System.Drawing.Imaging
Imports PQScan.PDFToImage
Namespace PDFToTIF
  Class Program
    Private Shared Sub Main(args As String())
      ' Generate a new PDFDocument instance from PQScan.PDFToImage.
      Dim pdf As New PDFDocument()

      ' Open PDF document to file stream
      Dim stream As New FileStream("sample.pdf", FileMode.Open)

      ' Load message from PDF document stream.
      pdf.LoadPDF(stream)

      ' Specify tif image width from PDF page
      Dim width As Integer = pdf.GetPageWidth(0) / 2
      ' Specify tif image height from PDF page
      Dim height As Integer = pdf.GetPageHeight(0) / 2

      'Convert PDF first page to image with the customized size
      Dim tif As Bitmap = pdf.ToImage(0, width, height)
      'Save image to tif format
      tif.Save("result.tiff", ImageFormat.Tiff)
    End Sub
  End Class
End Namespace