Only allow 2 digits past decimal point, numeric textbox

I wrote this sub for a textbox.... seems to work great, if anyone has some time and wants to TEST it..(make sure there are no flukes), I would appreciate any comments...

VB Code:

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        'only allows appendage of digits, one decimal point, and 2 decimal places
        If Not e.KeyChar.IsDigit(e.KeyChar) Then  'if not a digit
            If Not Asc(e.KeyChar) = 8 Then         'and not a backspace
                If Not TextBox1.Text.LastIndexOf(Chr(46)) = -1 Then 'and a decimal has already been added
                    'tell system not to send message to textbox
                    e.Handled = True
                End If
            End If
        Else 'if a digit
            'compare index of a decimal point (if it exists), and length of text
            If Not TextBox1.Text.LastIndexOf(Chr(46)) = -1 Then
                If TextBox1.TextLength > TextBox1.Text.LastIndexOf(Chr(46)) + 2 Then
                    'if length is over 2 spaces from decimal pt, don't
                    'send message to system
                    e.Handled = True
                End If
            End If
 
        End If
    End Sub

Only thing itmisses is if the first key you press is a space...