AjaxControlToolkit.AjaxFileUpload.AreFileUploadParamsPresent C# (CSharp) Метод

        bool AreFileUploadParamsPresent()
        {
            return  !string.IsNullOrEmpty(Page.Request.QueryString["contextkey"])
                    &&
                    Page.Request.QueryString["contextkey"] == ContextKey
                    &&
                    Page.Request.QueryString["controlID"] == ClientID;
        }