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Distance From Point To Line

using System; namespace ComputationalGeometry.Shapes {     public static class MathUtility     {         public static double DistanceFromPointToLine(Point2D point, Line2D line)         {             // given a line based on two points, and a point away from the line,             // find the perpendicular distance from the point to the line.             // see http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html             // for explanation and defination.             Point2D l1 = line.InitialPoint;             Point2D l2 = line.TerminalPoint;             return Math.Abs((l2.X - l1.X)*(l1.Y - point.Y) - (l1.X - point.X)*(l2.Y - l1.Y))/                     Math.Sqrt(Math.Pow(l2.X - l1.X, 2) + Math.Pow(l2.Y - l1.Y, 2));         }     } }