Role-Based Security implementation

Hello!i'm trying to create a role based security model and then reuse it every-time an winform app or webform app needs one.Searching on the net, i have found almost all the info how to implement such model but i dont know the best way to "attach" the role based security on a record of a DataTable. Let me explain better: my requirements are that for example every row(opr entity) on a DataTable must have a rol based access. Some users can see some records and others cant. Some users can modify(or delete) the records and some not.One record can be seen by a user but not by another. So, i believe all this stuf is lead in-to role based security.Any idea on how to implement such model?ps:i'm working in C#.Thank you.Evald. ...