Decimal Formatting Help

[Dragnorian]

Hello fellow forumers! I have been having this issue, I have made this program that basically counts how many say tenths are in a given range like say 10 to 0. Well, in the Display when the data is being shown, I get an output of: 10, 9.9,9.8,9.7,9.6,9.5,9.4,9.3,9.2,9.1,9, etc...
Well, I am wanting to make this program look professional so say where the 10 is, I would like it to say 10.0 or if they are say doing thousandths, it be like 10.000, Know what I mean? I have been to stackexchange, MSDN, but none pose a good solution to this matter. Any help works! Thanks

Code Area:

'Where I want to format
        While (startNum >= EndNum + 0.1)
            counter += 1
            startNum -= 0.1
            Data += startNum & vbNewLine
            valprint += startNum & Space(4)
            pgbProgress.Increment(1)
        End While
        starting = txtStart.Text
        rtbDisplay.Text = starting & vbNewLine & Data & vbNewLine
        rtbVerticalText.Text = starting & Space(4) & valprint
        lblCount.Text = counter
        btnClear.Enabled = True
        btnCount.Enabled = False
        txtStart.Enabled = False
        txtEnd.Enabled = False
    End Sub