DevExpress has the best support center I have ever seen, their Code Central really rocks and its fill with hundredths' of samples. One of them is is How to implement the MemberLevel security manually (for example, to deny the 'Read' access for declared properties of some business class, and allow access for the inherited properties eXpand has ...

eXpand has a new module that make its easy to protect selected members from selected object instances. It does the above by checking if in the current system has been granted a eXpand.ExpressApp.MemberLevelSecurity.Win.Security.ProtectRowMemberPermission with an allow Modifier. Then it will allow you to protect selected members of an object as ...