using System;

using NetTopologySuite;

using NetTopologySuite.Geometries;

public class Program

{

    public static void Main()

    {

        var location1 = GetLocation(72.6369D, 23.2156D);

        var location2 = GetLocation(72.63541D, 23.18025D);

        var distance = location1.Distance(location2);

        Console.WriteLine("Hello World" + (distance * 69.0468 * 1.60934));

    }

    public static Point GetLocation(double Long, double Lat)

    {

        var geometryFactory = NtsGeometryServices.Instance.CreateGeometryFactory(srid: 4326);

        return geometryFactory.CreatePoint(new Coordinate(Long, Lat));

    }

​

    public static decimal GetDistance(Point source, Point destination)

    {

        return Convert.ToDecimal(source.Distance(destination));

    }

}