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<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
        onselectedindexchanged="DropDownList1_SelectedIndexChanged">
        <asp:ListItem>aaa</asp:ListItem>
        <asp:ListItem>bbb</asp:ListItem>
    </asp:DropDownList>

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        string s = Request.Form["content1"];  //content1为文本域，但Request.Form["content1"]获取到的值是文本域默认值。如果服务器端控件是Button，其click事件则可以获取当前文本域的值，请问是否只有submit提交才能获取到编辑器里的当前值
    }