Ajax class Not defined __ajax

Busy a day, Web.config set correctly, inside are registered, where the correct place is always appear ' _default ' undefined.

Ajax.dll,ajaxpro.dll file changed several times, or there is such a problem,

That is, the class is undefined, and over the day the Internet finally found a solution:

1.

There is no runat=server form on the page, so it will not be generated when run

<input type= "hidden" name= "__viewstate" value= "ddwxnzc3mdq0mza2ozs+zq2gjqhju5luu3gystmlne2cl/i="/>
<script type= "Text/javascript" src= "/myhome/ajax/common.ashx" ></script>

<script type= "Text/javascript" src= "/myhome/ajax/br". Myhome.admin.adminmyhome,br. Myhome.ashx "></script>

Without this code, he would not communicate with the server side, causing the error to occur.