/// <summary>
/// Calculates the distance between two addresses and returns the distance.
/// </summary>
/// <param name="first">The first address.</param>
/// <param name="second">The second address.</param>
/// <returns>The distance between the two addresses.</returns>
private async Task <decimal> GetDistanceInKilometersAsync(Address first, Address second)
{
//Validate the addresses
var firstAsString = first.ToString();
var secondAsString = second.ToString();
var validateOrigin = _googleMapsApiService.ValidateAddressAsync(first);
var validateDestination = _googleMapsApiService.ValidateAddressAsync(second);
await Task.WhenAll(validateOrigin, validateDestination);
//Validation ok (otherwise an exception would be thrown above)
var distanceInKm = await _googleMapsApiService.GetDistanceInKmAsync(firstAsString, secondAsString);
return(distanceInKm);
}