How to get visitor IP address in static method?

        protected static string GetUserIPAddress()
        {
            string VisitorsIPAddr = string.Empty;
            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
            {
                VisitorsIPAddr = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
            }
            else if (System.Web.HttpContext.Current.Request.UserHostAddress.Length != 0)
            {
                VisitorsIPAddr = System.Web.HttpContext.Current.Request.UserHostAddress;
            }
            return VisitorsIPAddr;
        }