How to Convert Mixed Type of Images to PDF in VB.NET?

Imports System.IO
Imports PQScan.ImageToPDF

Namespace MixedTypeImageToPDF
    Class Program
        Private Shared Sub Main(args As String())
            'Create an instance of PQScan.ImageToPDF.PDFConverter object.
            Dim converter As New PDFConverter()

            'Set PDF page layout, A4 is most widely used.
            converter.PageSizeType = PageSizeMode.A4

            'Set mixed image type: tiff, bmp.
            Dim imgFiles As String() = New String(1) {"input1.tiff", "input2.bmp"}

            'Set output pdf stream.
            Dim fileStream As New FileStream("mixed-type.pdf", FileMode.Create)

            'Generate PDF from images.
            converter.CreatePDF(imgFiles, fileStream)
        End Sub
    End Class
End Namespace

Imports PQScan.ImageToPDF

Namespace AppendMixedTypeImageToPDF
    Class Program
        Private Shared Sub Main(args As String())
            'Create an instance of PQScan.ImageToPDF.PDFConverter object.
            Dim converter As PDFConverter = newPDFConverter()

            'Set PDF page layout, if to ImageSize, 
            'PDF page will display the original size and quality of the source image
            converter.PageSizeType = PageSizeMode.ImageSize

            'Set mixed image type: jpeg, gif and png.
            Dim imgFiles As String() = New String(2) {"input1.jpeg", "input2.gif", "input3.png"}

            'Set output pdf file name.
            Dim outFile As String = "append-to-pdf.pdf"

            'Append multiple type of images to PDF.
            converter.AppendToPDF(imgFiles, outFile)
        End Sub
    End Class
End Namespace