Get client PC IP address when my web application load

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ASP.NET

Get client PC IP address when my web application load
in my code it display me my server IP Address when i am going to host this code on server
I want to know the Client IP Address

string ipaddress;
           ipaddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
           if (ipaddress == "" || ipaddress == null)
               ipaddress = Request.ServerVariables["REMOTE_ADDR"];
           Response.Write("IP Address : " + ipaddress);