Problem with exchange rate calculator (google)

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C#

Hello all,

I want to convert exchange rage from one currency to another, Following is the code

string txt;
                        string url = "http://www.google.com/finance/converter?a=1&from=USD&to=INR";

                        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                        WebResponse response = request.GetResponse();
                        using (Stream responseStream = response.GetResponseStream())
                        {
                            StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
                            txt = reader.ReadToEnd();
                        }

the out put of "txt" variable is in the form of full html page. following is the part of html output

<div id=currency_converter_result>1 USD = <span class=bld>62.9100 INR</span>
<input type=submit value="Convert">
</div>

Previously I have tried following code but not success ...

string response = web.DownloadString(url);

           Regex regex = new Regex("rhs: \\\"(\\d*.\\d*)");
           Match match = regex.Match(response);

           rate = System.Convert.ToDecimal(match.Groups[1].Value);

Previously my code was working, but after the change of google API my code not worked ....

I am searching the solution as
1. I can serialize my currency Rate in to json format
2. I can use any API like google api , yahoo api , etc from the web.config file and my code will work for all.


Please help me and suggest me with perfect solution.
I am writing my app. in MVC 4 , with C#.


Thanks in advance

With Regards,
Manoj