将ObjectDataSource绑定到我的数据访问层中的现有方法

I've seen the designer code, and I have seen code which builds the ObjectDataSource in the code-behind, however both methods communicate directly with the database via either text commands or stored procs. This seems like unnecessary code duplication to me since my data access layer has a method already which returns a datatable with the data I need for this report. I've seen the designer code, and I have seen co