C# How to add distance and calculate new location from Lat\Lon

In one of my geo spatial projects I faced the need to calculate new Lat \ Lon location based on other Lat \ Lon Location , distance and bearing , for example what is the location that is 300 meters NE of a particular location as described in this illusrtartion :

Here is the formula that for given a start point, initial bearing, and distance it calculates the destination point and final bearing travelling along a (shortest distance) great circle arc

lat2 = asin(sin(lat1)*cos(d/R) + cos(lat1)*sin(d/R)*cos(θ))

lon2 = lon1 + atan2(sin(θ)*sin(d/R)*cos(lat1), cos(d/R)−sin(lat1)*sin(lat2))

Where d is the distance travelled and R is the earth’s radius , d/R is the angular distance (in radians)
Here is the a function written in C# that applies the formula :

const double EarthRadius = 6378137.0;
const double DegreesToRadians = 0.0174532925;
const double RadiansToDegrees = 57.2957795;
/// <summary>
/// Calculates the new-point from a given source at a given range (meters) and bearing (degrees). .
/// </summary>
/// <param name="source">Orginal Point</param>
/// <param name="range">Range in meters</param>
/// <param name="bearing">Bearing in degrees</param>
/// <returns>End-point from the source given the desired range and bearing.</returns>

public LatLon CalculateDerivedPosition(LatLon source, double range, double bearing)

{
double latA = source.Lat * DegreesToRadians;
double lonA = source.Lon * DegreesToRadians;
double angularDistance = range / EarthRadius;
double trueCourse = bearing * DegreesToRadians;

double lat = Math.Asin(Math.Sin(latA) * Math.Cos(angularDistance) +Math.Cos(latA) * Math.Sin(angularDistance) * Math.Cos(trueCourse));

double dlon = Math.Atan2(Math.Sin(trueCourse) * Math.Sin(angularDistance) * Math.Cos(latA),Math.Cos(angularDistance) - Math.Sin(latA) * Math.Sin(lat));
double lon = ((lonA + dlon + Math.PI) % (Math.PI * 2)) - Math.PI;

return new LatLon(lat * RadiansToDegrees,lon * RadiansToDegrees);

}