difference between dropddownlist and datatable after postback

Hi

Another question about viewstate and postback (hopefully with an answer ..)

I understand concept like postback and viewstate, but I don't understand why it's enough to set Enableviewstate to true for keeping the values of a dynamically filled dropdownlist while for a dynamically filled datatable, it requires to put the datatable in a session or viewstate variable. Both are form controls, both go though thr same PLC, so why this difference?

Tanjs

V