You have to install
GoogleMaps.LocationServices from the NuGet package. 
It uses Google's REST API to get lat/long for a given address. Using these you 
can get latitude and longitude without any need of any API Key.
To install GoogleMaps.LocationServices, run the following command in the 
Package Manger Console.
	
	PM> Install-Package GoogleMaps.LocationServices
	
	After Install the above package you can use it like this:
	
	Firstly, Adding this NameSpace.
	
	using 
	GoogleMaps.LocationServices;
	Then use  GoogleLocationService() 
	class to get the  
	latitude and longitude of any given address.
	
	Example:
 public
	
	
	static
	
	
	void
	
	
	Main()
	
	 {
	
	
	
	   var 
	address 
	
	=
	
	
	"75 
	Ninth Avenue 2nd and 4th Floors New York, NY 10011";
	
	   
	
	var 
	locationService 
	
	=
	
	
	new
	
	
	GoogleLocationService();
	
	   
	
	var 
	point 
	
	= 
	locationService.GetLatLongFromAddress(address);
	
	
	
	  
	
	var 
	latitude 
	
	= 
	point.Latitude;
	
	
	  var 
	longitude 
	
	= 
	point.Longitude;
	
	
	/
	
	
	 }
	
	
	
	Then you can easily plot it to the Google maps.