How do I set Group Permissions?

[sde]

I would like to programatically set group permissions.

 

For example, I would like: c:\dev to be read/executable by group: users

 

So far I found I should probably be using: Microsoft.Win32.Security, but I can not find any code examples. I'll post a solution when I found one, but in the mean time, any insight would be greatly appreciated.

 

Thanks.