二级DropDownList通过js获取，在后台如何取值？
1.aspx前台
<asp:DropDownList runat="server" ID="del_yslx">
</asp:DropDownList>

<script type="text/javascript">
..........
document.all("del_yslx").add(new Option("a","1"));
document.all("del_yslx").add(new Option("b","2"));



.......
</script>
1.aspx.cs后台
如何获取DropDownList选中的
del_yslx.text

[解决办法]
Refer:
http://www.cnblogs.com/insus/archive/2013/05/10/3070348.html

http://www.cnblogs.com/insus/archive/2012/10/16/2725307.html