In this tutorial you will learn, how you can get the latitude and longitude of an address using Google API in C#.

Google provide the following API url by returning an XML result when you passing a location address on the url.

http://maps.googleapis.com/maps/api/geocode/xml?address=[query address]&sensor=[true or false]

ex:
http://maps.googleapis.com/maps/api/geocode/xml?address=Sydney NSW Australia&sensor=false

sensor attribute define whether your device has a GPS sensor or not. If you develop an application through mobile that has GPS capability then you set the sensor value to true.

Let's starts with the coding in C#

// Import the following namespaces
using System.Xml;
using System.Xml.XPath;

Create the following function that will return a string containing latitude and longitude in separated comma.

public string GetLongitudeAndLatitude(string address, string sensor) {
    string urlAddress = "http://maps.googleapis.com/maps/api/geocode/xml?address=" + HttpUtility.UrlEncode(address) + "&sensor=" + sensor;
    string returnValue = "";
    try {
        XmlDocument objXmlDocument = new XmlDocument();
        objXmlDocument.Load(urlAddress);
        XmlNodeList objXmlNodeList = objXmlDocument.SelectNodes("/GeocodeResponse/result/geometry/location");
        foreach (XmlNode objXmlNode in objXmlNodeList) {
            // GET LONGITUDE 
            returnValue = objXmlNode.ChildNodes.Item(0).InnerText;

            // GET LATITUDE 
            returnValue += "," + objXmlNode.ChildNodes.Item(1).InnerText;
        }
    } catch {
        // Process an error action here if needed  
    }
    return returnValue;
  }

Here is how you use it, you just need to pass an address value and a sensor value.

string geoValue = GetLongitudeAndLatitude("32 george Sydney NSW Australia", "false");