A part of ListBox.Add's text as bold

[Kelapa]

Here is the lines of code that I only need txtFind.Text's text as bold at the last part of ListBox1.Add(.. ......)
How do I make it?

    Private Sub btnFindAndBring_Click(sender As Object, e As EventArgs) Handles btnFindAndBring.Click
        Dim folderName As String
        Dim ifileAmount As Integer
        If FolderBrowserDialog1.
ShowDialog() <> Windows.Forms.DialogResult.Cancel Then
            folderName = FolderBrowserDialog1.SelectedPath
            lblFolder.Text = folderName
            Dim valueOfStringToFind = My.Computer.FileSystem.FindInFiles(folderName, txtFind.Text, True, FileIO.SearchOption.SearchAllSubDirectories)
            For Each files In valueOfStringToFind
                ListBox1.Items.Add(files)
            Next
            ifileAmount = ListBox1.Items.Count
            'txtFind.Font = New Font(txtFind.Font, FontStyle.Bold)   'This comment does not work to make bold in a part of string
            ListBox1.Items.Add("- - - -" & "Result of " & txtFind.Text & " has " & ifileAmount & " file(s)" & "- - - -")
        Else
            FolderBrowserDialog1.Dispose()
        End If
    End Sub