使用JQuery .ajax时，使用jquery'json'vs'text'时不会调用Success方法

I have an ASP.Net web page attempting to retrieve data from an asmx webservice using the jquery .axax method. The ajax method correctly call a success method when the dataType = "text", however I cannot get it to return when using the dataType of "json". Can anyone see what I am missing? I am getting the 'json' example online at I have an ASP.Net web page attempting to retrie