How can I get latest currencry conversion rate?

Problem: 
 I want to build a currency converter on my web page. How can I get latest currency conversion rate from internet?

Solution:

To achieve it you can use web service which provides exchanging rate of currencies or develop this utility by yourself.

Using Web Service please check the links below:

http://www.codeproject.com/KB/webservices/currency_convertor_ws.aspx

You can also implement a custom currency converter:

http://www.codeproject.com/KB/cs/CurrencyConverter_Class.aspx