这个是什么错误啊
Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

一执行
type_note.Controls.Add(dTypeList);
就会有这个错误
控件
<asp:Panel ID= "type_note " runat= "server ">
</asp:Panel>

怎么解决啊


[解决办法]
在这行前面先设个断点，看看VS还有没有其他错误提示