These days I had a need to use ResultsetFields for fetching dynamic list. As you know, ResultsetFields derives from EntityFields2 (I am working with LLBLGenPro 2.0 .net 2) which is basically an array. There is nothing wrong with that, it is just you have to set its size beforehand (ok, you can explicitly expand or contract it later on) and you have to use indexes. But why would one need to deal with indexes and sizes? Hence, here is my solution…read my article and get source code here.