This error occurs only with DevExpress ASP.Net Quantum Grid (ASPxGridView). Microsoft ASP.Net's GridView binds fine. However, DevExpress grid also binds fine with classes that does not inherit from Entity (POCO). I will send the stack trace to support email.

The mail message is received, we'll investigate the issue soon.

I've looked up the stack trace. ASPxGridView really tries to serialize the data rows, possibly to:

• Cache the data @ HTTP session (to avoid query re-execution?)
• Cache the data @ ViewState (the same reason).

And definitely not to:

• Send the data to the client (regular serialization won't help here, they'd use JSON serializer or something similar).

Possible solutions:

1) Find out how to disable this behavior. I don't see much reasons for caching anything by grid itself. Logically, this must happen in lower layers (e.g. DAL). DevExpress designs their components for usability in typical & simple cases, so they added this feature (content caching) to grid.

If you'll really need to get some queries cached, we'll implement this API @ DO leve. Caching APIs is one of top-priority features for the next release.

2) If you need grid's caching, you must convert the result to DTOs before passing it to grid (i.e. add .Select(item => new MyDdo { ProperyX = item.PropertyX, ... })). This result will be still queryable, i.e. grid will be able to use IQueryable API to filter, sort and group it. If your DTOs will be serializable, grid will be able to cache them.

You are absolutely right. The grid has a property called EnableRowsCache. When I set it to false it worked fine. Thank you very much.

Good then ;)