RequestDataHelper.cs

    public static class RequestDataHelper
    {
        [MarkedForTermination("Use FubuMVC.Core.AjaxExtensions.IsAjaxRequest when updating FubuMVC.Core to latest or kill this when support for IE7 gets dropped.")]
        public static bool IsAjaxRequest(IRequestData requestData)
        {
            var result = false;
            requestData.Value(AjaxExtensions.XRequestedWithHeader, delegate(BindingValue value)
            {
                result = value.RawValue.isAjaxRequest();
            });
            if(!result)
            {
                requestData.Value(AjaxExtensions.XRequestedWithHeader.ToLowerInvariant(), delegate(BindingValue value)
                {
                    result = value.RawValue.isAjaxRequest();
                });
            }
            return result;
        }

        private static bool isAjaxRequest(this object value)
        {
            return AjaxExtensions.XmlHttpRequestValue.Equals(value as string, StringComparison.InvariantCultureIgnoreCase);
        }
    }