/*
Note to reader:
There are two server variables of interest; REMOTE_ADDR and HTTP_X_FORWARDED_FOR. As many visitors access the internet via a third party (ie their ISP), 
REMOTE_ADDR does not always contain their IP address... it contains their ISP's address. If this is the case, most browsers then store the users IP address in the
HTTP_X_FORWARDED_FOR variable. So, first, we check HTTP_X_FORWARDED_FOR, and then if that is empty, we try REMOTE_ADDR instead:
*/
 
string IP_Address =  HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if(String.IsNullOrEmpty(IP_Address))
{