>>>最好不要刷新本页if you want to do data binding, you have to go back to the server, ASP.NET 2.0 will support a concept of callback to allow you to do that, but for now, you have to use XMLHTTP to simulate it manuallybut for now, I would suggest that you set AutoPostBack=true and in the first DropDownList's SelectedIndexChanged event handler, do the databinding on the second DropDownList, it is easier
只要在第一个下拉框CHANGE的时候调用一个JAVASCRIPT方法就可以了..