在ascx中添加也UpdateProgress，然后把ascx拖放到aspx页面上，会在aspx页上提示有错，如下提示：
The control with ID 'UpdateProgress1' requires a ScriptManager on the page. The ScripManager must appear before any controls that need it.

说明：我已在UpdateProgress前添加了ScriptManager，仍还出错，我用的是vs2005