All I want to do is simply make something invisible...a navigation group on a DevExpress Navigation Bar Control.  Here is my attempt after setting up roles and permissions, then DDT to deploy:

if (SecurityBasics.CurrentUser.GetPermission("SystemMaintenance").Action == PermissionAction.Grant)
{
    AdminNavBarGroup.Visible = true;
}
else
{
    AdminNavBarGroup.Visible = false;
}

I have a role called "Administration".  A permission key was created for a category called Administration (not technically related).  The key is use above and it is called "SystemMaintenance".  The key is given grant rights for the "Administration" role.  I removed myself from that role to test.  The only thing that may be gumming up the works is the fact that my profile is marked as an administrator.  Does the administrator bypass any and all permission sets?

What would be nice is SecurityBasics.CurrentUser.IsInRole("Administration").  It would simply return a boolean value.  It look like I have to create a dictionary list then walk the list to see if the user is in the role or not.  Is that right?

Thanks for your help,
Bill

Yup.  That seems to work.  I am getting ready to test the change, now.  Should know something soon.

Well, if I do this:

SecurityBasics.DefaultPermissionInfo = new PermissionInfo(PermissionAction.Grant);

Then, I have to specifically deny people access to everything they should not have access to (the taking-away-the-keys-to-the-kingdom approach).  I see more why Greg suggested deny as the default (the don't-let-them-have-the-keys-at-all approach).  This will take a bit of time to setup.  I see why you suggest waiting until the end of the development process; however, I may have been better served to consider some of this stuff up-front.  

Thanks for your help, gents!
Bill 

You got it...this is the same approach that we take and we have good roles and data setup so that our customers can implement their desired security permissions easily.  But it is definitely best NOT to grant by default.

Any time Bill. It takes a while to really understand RBS, as it is pretty complex/full featured. It rocks though!