Well, today I was working with Google maps. I have more than 300,000 addresses and I needed to add dynamic Google maps to a website , I was looking around a little bit. At first I thought I have to use API 3 - with a limitation of 25,000 requests and that is a payed system-. Since, there are many misleading answers on the forums to this questions, I want to emphasize that API 3 is not for people who only want to add dynamic maps to a website !

  
There is a free solution for that! I found this Google Maps API V3 for ASP.NET at Codeproject. It is a very fast way of learning how to put things in order (I did not even read it I just took a look at the JavaScript code ! ) and to be honest I don't understand the reason of putting this article in Asp.net category. It is only simple JavaScript, so you can use it in PHP or even simple HTML ! The problem is if you have the address but not latitude and longitude you can not still really use it, so I found this GeoCoding with C# and Google Geocoding API V3 . They described actually how you can get the information of an address using API for free. a sample would be http://maps.googleapis.com/maps/api/geocode/xml?address=Duettgatan+3+Karlstad+65636+Sweden &sensor=false and it gives you the information of the address including latitude and longitude! try it it is a XML ! try your address it is actually pretty much smart and flexible ! The rest was piece of cake; writing a class to take the address and give you the latitude and longitude so you can use it in the map ! here is the class I made ! Note : If you are using this c# code add a reference to the name space (Rooznamechi.Codes) at top of your codes so it works! using Rooznamechi.Codes ; Also lots of credit goes to mentioned article above, I just trimmed it reshaped it as a class and posted it !

using System; 

using System.Net; 

using System.Xml.XPath; 

namespace Rooznamechi.Codes {

 public class GoogleGeocode { 

public static string[] getLatLng(string adress) {

 string[] resuts = new string[] {"0","0"}; 

string url = "http://maps.googleapis.com/maps/api/geocode/" + "xml?address=" + adress + "&sensor=false";

 WebResponse response = null;

 try { 

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

request.Method = "GET"; 

response = request.GetResponse();

 if (response != null) {

 XPathDocument document = new XPathDocument(response.GetResponseStream()); 

XPathNavigator navigator = document.CreateNavigator(); 

// get response 

status XPathNodeIterator statusIterator = navigator.Select("/GeocodeResponse/status"); 

while (statusIterator.MoveNext()) { 

if (statusIterator.Current.Value != "OK") { 

return resuts; } } 

// get results 

XPathNodeIterator resultIterator = navigator.Select("/GeocodeResponse/result");

 if (resultIterator.MoveNext()) { XPathNodeIterator geometryIterator = resultIterator.Current.Select("geometry");

 if (geometryIterator.MoveNext()) { XPathNodeIterator locationIterator = geometryIterator.Current.Select("location"); 

if (locationIterator.MoveNext()) { XPathNodeIterator latIterator = locationIterator.Current.Select("lat");

 if (latIterator.MoveNext()) { resuts[0] = latIterator.Current.Value; 

} XPathNodeIterator lngIterator = locationIterator.Current.Select("lng");

 if (lngIterator.MoveNext()) { resuts[1] = lngIterator.Current.Value; 

} 

}

 }

 }

 } 

return resuts; 

} catch (Exception ex) { 

//handle Error your way 

return resuts; 

} 

}

 }

 }