How do I get the selected files in this code to show in a list box?

Code:
Public Class Form1


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

        Dim BtBrowse As New FolderBrowserDialog()

        BtBrowse.SelectedPath = "C:\"

        If BtBrowse.ShowDialog() = Windows.Forms.DialogResult.OK Then

            For Each File As String In My.Computer.FileSystem.GetFiles(BtBrowse.SelectedPath, FileIO.SearchOption.SearchTopLevelOnly, "*.txt")
            Next

        End If

    End Sub

End Class

My lack of knowledge prohibits me from giving more info, so if you need more info, please ask and I will do my best to explain my desired results. I am just trying to learn.

Thanks