Proper way to accept DTMF credit card numbers

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  Ok, I have been struggling with this for the past few hours and I cannot get past the first digit.
  
  What is the proper way to setup a grammer file for accepting multiple numbers and the # sign (hash) or no more than 16 digits entered being the terminating entry?
  
  VB.NET please.... This converting from C# to VB is taking WAY TOO LONG.
  
  Thanks in advance..

  Tuesday, March 16, 2010 9:56 PM