Can u generate dropdownlists at runtime?

Question

Hi, i have an xml file.... when the page is loding i need to generate a dropdownlist with the elements of the root node. Next when i will select the element in the first dropdownlist , i will generate next DDL with corresponding nodes from the XML file.... Next when i will select an element from the second DDL , third DDL generation....... this is the cycle process depends on the xml file.... ALL the selected DDLs enabled=false; here the problem is .. i will generate 1,2 DDLs r ok... after the 3rd onwards i cant handle the event(SelectedIndexChanged)... then i cant get 3rd DDL... Just guide me how to generate DDLs and their events......... sekhar