Distance Between 2 cities, using Google Distance Matrix, in c#

public Double GetDistanceInMilesBetweenTwoCities( string city1, string city2 )
{


////Pass request to google api with origin and destination details(Map Coords)


HttpWebRequest request =

( HttpWebRequest )WebRequest.Create( "http://maps.googleapis.com/maps/api/distancematrix/json?origins="


+ city1 + "&destinations=" + city2 + "&mode=Car&language=us-en&sensor=false" );

HttpWebResponse response = ( HttpWebResponse )request.GetResponse();

using ( var streamReader = new StreamReader( response.GetResponseStream() ) )






{


var json = streamReader.ReadToEnd();

if ( !string.IsNullOrEmpty( json ) )






{


//Uses the NewtonSoft Json library that is shipped in vs 2013, the .N3.5 version to match this service. (thank you stack overflow!) - EWB


Parent parent = JsonConvert.DeserializeObject<Parent>( json );

if ( parent.rows[ 0 ].elements[ 0 ].status.ToUpper() != "OK" )






{


throw new Exception("Invalid City Name please try again");






}


Double distInKM = parent.rows[ 0 ].elements[ 0 ].distance.value;

return DistanceCoversion.ConvertMetersToMiles( distInKM );






}


}


return -1;






}





public class DistanceCoversion





{

<snip>











public static Double ConvertMetersToMiles( Double meters )






{


//


// Multiply by this constant.


//


return (meters/1000) * 0.621371192;






}


}