Get User IP address using c#

public string GetIPAddress()

        {

            string ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

            if (string.IsNullOrEmpty(ip))

                ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

            else

                ip = ip.Split(',')[0];

            return ip;

        }