Can't Parse textbox.

[Mugsy323]

I'm trying to restrict the input of a text box to allow only numbers (0-9). I intercept "KeyDown" and update Textbox1.Text only if a number is typed:

(Updated)
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Public Class Form1
    Dim strPreviousID As String = ""

    Private Sub TextBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles Textbox1.KeyDown
        If e.KeyValue > 95 And e.KeyValue < 106 Then    ' Only ASCII values from "0" to "9".
            strPreviousID += Chr(e.KeyValue - 48)            ' ASCII value is Keyboard - 48
        Else
            TextBox1.Text = strPreviousID
        End If
        strPreviousID = TextBox1.Text
    End Sub
End Class

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PROBLEM (Updated): If the very first character is not a number, it STILL appears in the text box. If you type anything other than a number, the box contents are replaced with that one letter.

For the life of me, I can not figure out how to stop non-numeric values from appearing.

All "solutions" found online either don't work with VB.Net or are wildly unnecessarily complex.

So instead of "KeyDown", I tried "TextChanged":

Public Class Form1
    Dim strPreviousID As String = ""

    Private Sub Textbox1_TextChanged(sender As Object, e As EventArgs) Handles Textbox1.TextChanged
        If Textbox1.Text.Last.ToString >= "0" And Textbox1.Text.Last.ToString <= "9" Then ' Only "0" thru "9".
            strPreviousID += Textbox1.Text.Last.ToString
        Else
            Textbox1.Text = strPreviousID
        End If
        Textbox1.Text = strPreviousID
    End Sub
End Class

This comes with its own set of problem. Numbers work fine, but "If" line throws an exception if anything other than a number is typed.

I'm stumped. TIA