I would like to explain the reason why I like the ChangingAware version: I have understood how to make my own filtering inside PopulateListControlt(DropDownList1) which is a quite simple than trying to understand more complex versions of cascading like “Part 3 – A Cascading Hierarchical Field Template & Filter for Dynamic Data (http://csharpbits.notaclue.net/2010/06/part-3-cascading-hierarchical-field.html)”