Hello,

Actually your WebGrid is bound mode (bind with class of data table).
You should not load user control in PageLoad because you add into WebPaneManager. That's why the error raised.
I also modified your WebGrid bind and structure. You did in wrong way. Please remember that you need to bind WebGrid in IntializeDataSource event and set the Column (structure) in prepareDataBinding (not in PageLoad).

Regards,
Handy

Hi Handy

     Thank you for your response. There is another question.Can I use unbound mode(this time not a datatable) to add data in page's onPreRender event.Let WebGrid allow edit.I want to catch the edit event and do something myself.

Thanks

Hi Hepeng,

In unbound mode, you can also edit. But if there is any flypostback response (sorting, update, delete, filter, etc), the Grid will return error such as "Unable to communicate with server" because Unbound mode is not designed that way.

Regards,
Handy