GridView - Callback error handling

I do handle it. But do I need to throw an Exception for the callback so that the gridView raises the CallbackError?

Hello Adam,
Yes, the ASPxClientGridView.CallbackError event is fired if an exception is thrown during a callback on the server-side. Please refer to the Handling Callback Exceptions on Client article to learn more about this. If you want to set a custom error text in a special row at the bottom of the grid's Edit Form use the GridViewExtension.SetEditErrorText method for this task. You can see how it works in the GridView - Edit Modes demo.
If your scenario is different, please describe it in greater detail.

I do know how to handle this event when I throw an Exception on the server side, this is not a problem :). I don't want to throw an Exception because we use Error monitoring tool that gives us error info which is handled properly. That's why I was wondering if there is anyway to fire up this event without throwing an Exception on the server side. Modify the Request in any way? I hope this gives you more detail in the situation.

Hello Adam,
This event is raised only after an exception is thrown on the server side. Thus, there is no way to fire it without this condition. It's also not quite clear why you want to use this event if you catch an exception using your own tool. If you want to inform the client side about an error, you can pass information about it to a view using ViewData, send this information to the client side, and display it using the MVCxClientGlobalEvents.EndCallback event (see the ASP.NET MVC - Provide the capability to handle the CallbackError event globally (implement an ASPxGlobalEvents equivalent) thread).
Let me know whether or not this suggestion is helpful to you.

Thank you. I'll try to resolve my problem in another way.