static long BenchBLToolkit_List(int mappingsCount)
{
var list = new List<B2>();
for (var i = 0; i < mappingsCount; i++)
list.Add(new B2());
var sw = new Stopwatch();
sw.Start();
var dest = BLToolkit.Mapping.Map.ListToList<A2>(list);
sw.Stop();
return sw.ElapsedMilliseconds;
}