Ok,Here is exactly where it is:

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
total.Value = bytes.RawValue
TextBox1.Text = bytes.RawValue

If total.Value = 1073741824 Then
tb.Text = "test"
End If


End Sub
End Class

And it still wont change the text in tb.