Validating Masked Textboxes

Hi I'm using VB 2005, WinForms. I need to validate a Masked TextBox that I have on my Form, which is formatted for telephone numbers [i.e. (999) 000-0000]. If I try to determine the length of the textbox's text property using "myMaskedTextBox.Text.Trim.Length", I get a value of 10 on an empty phone number (empty meaning no numbers entered). I assume the masking characters are being considered as part of the overall length, so how do I count the number of actual "numbers" in the textbox? I need there to be a total of 10 valid digits in the field before it is accepted as a complete and accurate phone number.  

Any suggestions?

Thanks,
Fulano

If myMaskedTextBox.Text.Trim.Length < 10 Then
   Console.WriteLine("Not a valid phone number")
End If

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