The one below has class="brush:csharp" and although it is not as fancy as I hoped it would be it seems reasonably functional:

public interface IFoo
{
    public IEnumerable<Bar> Bars
    {
         get;
         set;
    }

    public abstract Bar ExecuteOnce(string message);

    public IEnumerable<Bar> ExecuteManyManyManyTimes(int times, string message) {
         var theBar = new Bar();
         for(var i = 0; i < times; i++) {
              var theBars = Bars.Where(bar => bar != theBar).Select(bar => bar.Fubar());
              foreach(var bar in theBars)
              {
                   yield return bar;
              }
         }
    }
}

Just keep in mind to replace those < and >’s with < and > respectively otherwise your comment still won’t look right.

Basic markup is apparently also allowed (quite a lot of tags actually) but please be gentle.