how to get country name using ip address

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ASP.NET

C#3.5

entity-framework

Hi,

//client connecting to a web server through an HTTP proxy or load balancer
           String ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

           if (string.IsNullOrEmpty(ip))
           {
               ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
           }

           return ip;

am getting the ip address using this code how can i get country name by using this ip address please help me