public double GradeIn { get; set; }

Public Property GradeIn As Double
	Get
	Set

public:
property double GradeIn {
	double get ();
	void set (double value);
}

Note that this property will fail for the first PVI in the profile. The profile starts and ends with a PVI point, but these start and end PVI points only contain half the necessary information - it is essentially a PVI that is cut in half.