>>Should each cursoradapter object have its private connection handle ?
>When several CursorAdapter objects share the same ODBC connection/statement handle, CursorFill for some of them may fail because another CursorAdapter haven't finished fetch. To workaround this problem set FetchSize=-1 for all CursorAdapter objects or use dedicated ODBC connection/statement handle for each of them. I personally prefer the second.

Hi Aleksey
I set FetchSize=-1 for all CursorAdapter objects and now the form work as I expected. Thanks!
I am curious why you prefer second method (dedicated ODBC connections).
For me the method has two seriuos disadvantages:
- it is not comfortable in case when several cursors participate in the same transaction (you have to bind conections using token)
- it seems that form with many cursor will consume more SQLServer resources than it is needed (I wonder if it could cause exceeding MSDE limits).