如何在 Button1_Click事件中让 中的所有选项都为selected状态?
test.aspx
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<SELECT id="jobfamily" style="WIDTH: 205px" multiple size="6" name="jobfamily" runat="Server">
<option value="0012">销售(非技术类)</option>
<option value="0037">商务,贸易</option>
<option value="0045">翻译(口译与笔译)</option>
<option value="0047">其它</option>
</SELECT>
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
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test.aspx.cs
private void Button1_Click(object sender, System.EventArgs e)
{
//这里如何把jobfamily中的所有option 都变为selected状态?
}