Development Class C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class Utility
{
    public static double CalculateDistance(double pStartLat, double pStartLong, double pEndLat, double pEndLong)
    {
        double distance = /*for conversion in Metres*/
                           1000 *
            /*radius of earth in km*/
                           6378.7 * Math.Acos(Math.Sin(pStartLat / 57.2958)
                                  * Math.Sin(pEndLat / 57.2958)
                                  + Math.Cos(pStartLat / 57.2958)
                                  * Math.Cos(pEndLat / 57.2958)
                                  * Math.Cos((pEndLong / 57.2958) - (pStartLong / 57.2958)));
        return distance;
    }
}