namespace System.Web.Mvc {
    using System;

    public static class AjaxRequestExtensions {

        public static bool IsAjaxRequest(this HttpRequestBase request) {
            if (request == null) {
                throw new ArgumentNullException("request");
            }
            
            return (request["X-Requested-With"] == "XMLHttpRequest") || ((request.Headers != null) && (request.Headers["X-Requested-With"] == "XMLHttpRequest"));
        }
    }
}