May be you can try
Private Sub btnDS_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDS.Click
lNumbers.Sort()
Dim MessageToShow as String
For I as Integer = 0 to lNumbers.Count
MessageToShow &= "Score " & (I + 1).Tostring & ": " & lNumbers.Item(I).Tostring & ControlChars.CrLf
Next
MessageToShow &= ControlChars.CrLf & "Total: " & totalScore.ToString & ControlChars.CrLf
MessageToShow &= "Average: " & averageScore.ToString
MessageBox.Show(MessageToshow)
End Sub
Hope this helps