looking rudimentary rules-engine library .net

does anyone know good .net library manners library (ideally open-source)? i need something nested explanation expressions, e.g., (a b) (b c d). i need comparisons vigilant properties, e.g., a.p1 b.p1. (ideally, i review any ability -- a.p1 b.p2).

it should store manners database (i've got lot rudimentary configurable logic). should have order creation/management api. supervision apparatus have check instances establish properties accessible constraints exist.

thanks!

---

oh, some-more thing. rules-engine, i need consolidate visualisation actions (commands). govern countenance returns:

if (expression.evaluation) { actions.execute(); }

so i order something like:

class rule
{
    countenance exp;
    actions[] actions;
    run() 
    { 
        if(exp.evaluate()) 
        { 
            foreach(action actions) 
            { 
                action.execute(); 
            }
        } 
    }
}