此博客展示了一个ASP.NET的下拉列表选择示例代码。使用C#语言，当页面回发时，会显示所选下拉列表项的值。页面包含一个下拉列表，提供马德里、奥斯陆、里斯本三个选项，还有一个提交按钮。
<%@ Page Language="c#" %>
<script runat="server">
void Page_Load()
{
if (Page.IsPostBack) {
Message.Text = "You have selected " + list1.SelectedItem.Value;
}
}
</script>
<html>
<head>
<title>Drop Down List Example</title>
</head>
<body>
<asp:Label id="Message" runat="server"></asp:Label>
<br />
<form runat="server">
Which city do you wish to look at hotels for?<br />
<br />
<asp:dropdownlist id="list1" runat="server">
<asp:listitem>Madrid</asp:listitem>
<asp:listitem>Oslo</asp:listitem>
<asp:listitem>Lisbon</asp:listitem>
</asp:dropdownlist>
<br />
<br />
<br />
<br />
<input type="submit" value="提交查询内容" />
</form>
</body>
</html>
<script runat="server">
void Page_Load()
{
if (Page.IsPostBack) {
Message.Text = "You have selected " + list1.SelectedItem.Value;
}
}
</script>
<html>
<head>
<title>Drop Down List Example</title>
</head>
<body>
<asp:Label id="Message" runat="server"></asp:Label>
<br />
<form runat="server">
Which city do you wish to look at hotels for?<br />
<br />
<asp:dropdownlist id="list1" runat="server">
<asp:listitem>Madrid</asp:listitem>
<asp:listitem>Oslo</asp:listitem>
<asp:listitem>Lisbon</asp:listitem>
</asp:dropdownlist>
<br />
<br />
<br />
<br />
<input type="submit" value="提交查询内容" />
</form>
</body>
</html>
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