If you want to hide name and assembly details of classes you return in your AjaxMethod simple add the AjaxPro.AjaxNoTypeUsage attribute as meta information:
[AjaxPro.AjaxNoTypeUsage]<span class="kwrd">public</span> <span class="kwrd">class</span> MyReturnValue
{
<span class="kwrd">public</span> <span class="kwrd">string</span> FirstName;
<span class="kwrd">public</span> <span class="kwrd">int</span> Age;
<span class="kwrd">public</span> <span class="kwrd">bool</span> IsMarried;
}</pre>
Adding this will remove the JSON property __type from the result value. You will save some bytes (i.e. if used in arrays) and get rid of internal information of your namespace and assembly name conventions.
<pre class="csharpcode"><span class="rem">// before</span>
var json = {__type:<span class="str">"MyNamespace.MyClass,MyAssemnly"</span>,<br> Firstname:<span class="str">"Michael"</span>,Age:29,IsMarried:<span class="kwrd">true</span>};
<span class="rem">// after</span>
var json = {Firstname:<span class="str">"Michael"</span>,Age:29,IsMarried:<span class="kwrd">true</span>};</pre>