Indicates the type of the specified TrackData .
ttUnknown(0), ttTrack1(1), ttTrack2(2)
This property will be filled after a call to ValidateCard. If magnetic stripe data was supplied in the TrackData field, this property will indicate which type of track was entered. If no track data was entered (ie, the CardNumber was specified instead) then the TrackType will be ttUnknown.
This property is read-only and not available at design time.