Select users based on Profile property

Hi all, Hopefully someone here can help me, I've been looking all over and can't seem to find a solution for this.  I'm using the built-in .NET Membership/Profile providers.
I need to select users that match a certain profile property.  Example: A profile property is "ClientID" (which associates which company/client a user belongs to).  I need to select all the users in the system that match that ID (so where ClientID = 1).
Once I have this, I need to bind it to a GridView.
If anyone can help, it would be greatly appreciated!

Thanks, 
...