How to get client's IP Address in Load Balanced Environment

        public static string GetIPAddress(NameValueCollection serverVariables)
        {
            var ip = serverVariables["HTTP_X_FORWARDED_FOR"];

            if (!string.IsNullOrEmpty(ip))
            {
                string[] ipRange = ip.Split(',');

                if (null != ipRange && ipRange.Length > 0)
                {
                    int le = ipRange.Length - 1;
                    string trueIP = ipRange[le];
                    ip = trueIP;
                }
                else
                {
                    ip = serverVariables["REMOTE_ADDR"];
                }
            }
            else
            {
                ip = serverVariables["REMOTE_ADDR"];
            }
            
            return ip;

        }

        Ex: string userIPAddress = GetIPAddress(Request.ServerVariables);