How can I type Numbers only and One Decimal Only in textbox using VB.NET

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VB

Please Help!

I just want my textbox to accept Numbers only and ONE Decimal point only.. of course Backspace and Delete button should working too.

here is my code

Private Sub txtCost_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtCost.KeyPress
      If e.KeyChar <> ControlChars.Back Then
          e.Handled = Not (Char.IsDigit(e.KeyChar) Or e.KeyChar = ".")
      End If
  End Sub

Please Help me.. thanks!