adding one or more document files to a new document using vb.net

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VB

here in the below coding a paragraph is added to new document created with vb.net coding, but i need to merge a document file in the newly created document, kindly guide me the coding...........

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

      Dim oMissing As Object = System.Reflection.Missing.Value
      Dim oEndOfDoc As Object = "\endofdoc"
      ' \endofdoc is a predefined bookmark

      'Start Word and create a new document.
      Dim oWord As Word._Application
      Dim oDoc As Word._Document
      oWord = New Word.Application()
      oWord.Visible = True
      oDoc = oWord.Documents.Add(oMissing, oMissing, oMissing, oMissing)

      'Insert a paragraph at the beginning of the document.
      Dim oPara1 As Word.Paragraph
      oPara1 = oDoc.Content.Paragraphs.Add(oMissing)
      oPara1.Range.Text = "Heading 1"
      oPara1.Range.Font.Bold = 1
      oPara1.Format.SpaceAfter = 24
      '24 pt spacing after paragraph.
      oPara1.Range.InsertParagraphAfter()