本文介绍如何在ASP.NET中使用C#代码修改HTML Select元素的Multiple属性，通过一个具体的示例展示如何在用户点击按钮时动态改变下拉框的选择行为。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void SubmitBtn_Click(object sender, EventArgs e)
{
firstselect.Attributes.Add("Multiple", "True");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>AttributeCollection Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Make a selection:
<select id="firstselect"
runat="server">
<option>This</option>
<option>That</option>
<option>Other</option>
</select>
<br/><br/>
<input type="submit"
id="submitbtn"
value="modify attribute"
onserverclick="SubmitBtn_Click"
runat="server"/>
</div>
</form>
</body>
</html>
https://docs.microsoft.com/zh-cn/dotnet/api/system.web.ui.attributecollection.add?redirectedfrom=MSDN&view=netframework-4.7.2#System_Web_UI_AttributeCollection_Add_System_String_System_String_
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