Distance calulation

Question

i have this code 

public double GetDistance(double latitude1, double longitude1, double latitude2, double longitude2)

{

var firstCordinate = new GeoCoordinate(latitude1, longitude1);

var secondCordinate = new GeoCoordinate(latitude2, longitude2);

double distance = firstCordinate.GetDistanceTo(secondCordinate);

return distance;

}

 

i want to attach it onto my currentRoute obtained: GeoCoordinate CurrentLocCoordinate = new System.Device.Location.GeoCoordinate(latitude, longtitude);