Merge pdf using Docotic.Pdf Library

I already have a class that does this but I want you to finish programming a NEW class using the Docotic.Pdf Library Their website for your reference is: http://bitmiracle.com/pdf-library/
this code which i write.
Public Class Form1 Private Sub butMergePdfs_Click(sender As System.Object, e As System.EventArgs) Handles butMergePdfs.Click ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 'Load some sample PDF files into the string arrays 'In production it will read the files into the string arrays 'from a database. ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Dim strMergeFiles(3) As String Dim strMergeTitles(3) As String strMergeFiles(0) = "D:\Nayeem_Mansoori\Cis_Projects\Cis_Projects\SanjayVerma\PdfMergeTest\PDF_1.pdf" strMergeFiles(1) = "D:\Nayeem ...