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    <p>Answered also <a href="https://stackoverflow.com/questions/849211/shortest-distance-between-a-point-and-a-line-segment">Shortest distance between a point and a line segment</a> because that gathers solutions in all languages. Answer put also here because this questions asks specifically a C# solution. This is modified from <a href="http://www.topcoder.com/tc?d1=tutorials&amp;d2=geometry1&amp;module=Static" rel="nofollow noreferrer">http://www.topcoder.com/tc?d1=tutorials&amp;d2=geometry1&amp;module=Static</a> :</p> <pre><code>//Compute the dot product AB . BC private double DotProduct(double[] pointA, double[] pointB, double[] pointC) { double[] AB = new double[2]; double[] BC = new double[2]; AB[0] = pointB[0] - pointA[0]; AB[1] = pointB[1] - pointA[1]; BC[0] = pointC[0] - pointB[0]; BC[1] = pointC[1] - pointB[1]; double dot = AB[0] * BC[0] + AB[1] * BC[1]; return dot; } //Compute the cross product AB x AC private double CrossProduct(double[] pointA, double[] pointB, double[] pointC) { double[] AB = new double[2]; double[] AC = new double[2]; AB[0] = pointB[0] - pointA[0]; AB[1] = pointB[1] - pointA[1]; AC[0] = pointC[0] - pointA[0]; AC[1] = pointC[1] - pointA[1]; double cross = AB[0] * AC[1] - AB[1] * AC[0]; return cross; } //Compute the distance from A to B double Distance(double[] pointA, double[] pointB) { double d1 = pointA[0] - pointB[0]; double d2 = pointA[1] - pointB[1]; return Math.Sqrt(d1 * d1 + d2 * d2); } //Compute the distance from AB to C //if isSegment is true, AB is a segment, not a line. double LineToPointDistance2D(double[] pointA, double[] pointB, double[] pointC, bool isSegment) { double dist = CrossProduct(pointA, pointB, pointC) / Distance(pointA, pointB); if (isSegment) { double dot1 = DotProduct(pointA, pointB, pointC); if (dot1 &gt; 0) return Distance(pointB, pointC); double dot2 = DotProduct(pointB, pointA, pointC); if (dot2 &gt; 0) return Distance(pointA, pointC); } return Math.Abs(dist); } </code></pre>
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    1. POhow to calculate shortest 2D distance between a point and a line segment in all cases in C, C# / .NET 2.0 or Java?
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    1. COErr, which points A,B,C are the line end points and which is the actual singular point ? You should really name the vars properly, tahts why we use names and not numbers.
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