Creates a CorridorSlopePattern with two feature lines and the style.
public CorridorSlopePattern Add( CorridorFeatureLine featureLine1, CorridorFeatureLine featureLine2, ObjectId slopePatternStyleId )
Public Function Add ( featureLine1 As CorridorFeatureLine, featureLine2 As CorridorFeatureLine, slopePatternStyleId As ObjectId ) As CorridorSlopePattern
public: CorridorSlopePattern^ Add( CorridorFeatureLine^ featureLine1, CorridorFeatureLine^ featureLine2, ObjectId slopePatternStyleId )