The length, in case of balusters, it is a distance from a previous one. For a post, it is a space from the original position of the post.

public double DistanceFromPreviousOrSpace { get; set; }

Public Property DistanceFromPreviousOrSpace As Double
	Get
	Set

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