I want use "disconnected model" to access database. Dataprovider which I am using is "OLEDB", I have a database to manage students in a school, I want get students in a class but i can't. After accessing database, the thing I received is a table which involved all of the students in the school. When I used "connection model" to access database. I can do get students in a class by using "@SelectedClass" parameter. May you help me ???