C#

/// <summary>
/// Will return the distance between two lat and long in km
/// </summary>
/// <param name="location"></param>
/// <returns></returns>
public double HaversineDistance(Location location) {
	double R = 6371; // Radius of the earth in km
	double dLat = (location.Latitude - Latitude).ToRadians();  // Javascript functions in radians
	double dLon = (location.Longitude - Longitude).ToRadians();
	double a = Math.Pow(Math.Sin(dLat / 2), 2) +
		Math.Cos(Latitude.ToRadians()) * Math.Cos(location.Latitude.ToRadians()) *
		Math.Pow(Math.Sin(dLon / 2), 2);
	double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
	double d = R * c; // Distance in km
	return d;
}

naveen 2012 wrote:

calculate distance between those latlongs