Question: how to calculate distance in km between two latitude and longitude in c#?
Answer: public double GetDistanceBetweenPoints(double lat1, double long1, double lat2, double long2)
{
double distance = 0;
double dLat = (lat2 - lat1) / 180* Math.PI;
double dLong = (long2 - long1) / 180 * Math.PI;
double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2)