俩DropDownList联动问题？

Question

在DropDownList1上加上AutoPostBack="True" SelectedIndexChanged=DropDownList1_SelectedIndexChangedpublic void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{
     给DropDownList2绑定数据
}

Answer 1

autopostback设置为True,在DropDownList1_Indexchange()事件中Coding

Answer 2

对，一定要把在DropDownList1的AutoPostBack设为"True" ，
然后把要对DropDownList2的操作写在DropDownList1的SelectedIndexChanged事件里

Answer 3

对，一定要把在DropDownList1的AutoPostBack设为"True" ，
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哦，原来我就少了这一步，谢谢各位了:)