Distance between two points by postcode

distance

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
 
namespace distance
{
    class distance
    {
        const double PIx = 3.141592653589793;
 
        private double LatFrom = 0;
        private double LonFrom = 0;
 
        private double LatTo  = 0;
        private double LonTo = 0;
 
        private string PostCodeFrom = "";
        private string PostCodeTo   = "";
 
        public distance(string PostCodeFrom, string PostCodeTo)
        {
            this.PostCodeFrom   = PostCodeFrom;
            this.PostCodeTo     = PostCodeTo;
 
            PostCodeFrom    = PostCodeFrom.Replace(" ", "%20");
            PostCodeTo      = PostCodeTo.Replace(" ", "%20");
 
            string from = "http://maps.google.com/maps/geo?q=" + PostCodeFrom + "&output=xml";
            string To   = "http://maps.google.com/maps/geo?q=" + PostCodeTo   + "&output=xml";
 
            if (string.IsNullOrEmpty(from)) return;
            if (string.IsNullOrEmpty(To)) return;
 
            XmlDocument xmlDocFrom = new XmlDocument();
            xmlDocFrom.Load(from);
 
            XmlDocument xmlDocTo = new XmlDocument();
            xmlDocTo.Load(To);
 
            XmlNodeList GetFromCords = xmlDocFrom.GetElementsByTagName("coordinates");
            XmlNodeList GetToCords = xmlDocTo.GetElementsByTagName("coordinates");
 
            Console.WriteLine("xml From " + GetFromCords[0].InnerText);
            Console.WriteLine("xml To " + GetToCords[0].InnerText);
 
            string[] FromSplit = GetFromCords[0].InnerText.Split(',');
            string[] ToSplit = GetToCords[0].InnerText.Split(',');
 
            LonFrom = ConvertToDouble(FromSplit[0].Trim());
            LatFrom = ConvertToDouble(FromSplit[1].Trim());
 
            LonTo = ConvertToDouble(ToSplit[0].Trim());
            LatTo = ConvertToDouble(ToSplit[1].Trim());
 
            double result = 0.0;
 
            Console.WriteLine("From " + LonFrom + ", " + LatTo);
            Console.WriteLine("To " + LonTo + "," + LonTo);
 
            result = CalcDistance(LatFrom, LonFrom, LatTo, LonTo);
            Console.WriteLine(result + "m");
 
            Console.ReadLine();
 
        }
 
        private double DistanceBetweenTwoPlaces()
        {
            return 0.0;
        }
 
        private double ConvertToDouble(string x)
        {
            double y = 0.0;
 
            try
            {
                y = Convert.ToDouble(x);
            }
            catch (FormatException)
            {
                return y;
            }
 
            return y;
        }
 
        public double Radians(double x)
        {
            return x * PIx / 180;
        }
 
        public double CalcDistance(double lat1, double long1, double lat2, double long2)
        {
            int R = 3959;
            double dLat = Radians(lat1 - lat2);
            double dLon = Radians(long1 - long2);
 
            double latOne = Radians(lat1);
            double latTwo = Radians(lat2);
 
            double a =  Math.Sin(dLat/2) * Math.Sin(dLat/2) +
                        Math.Sin(dLon/2) * Math.Sin(dLon/2) * Math.Cos(latOne) * Math.Cos(latTwo);
            double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
 
            return Math.Round(R * c, 2);
 
        }
 
    }
}