只有设置了 runat="server" ，在后台才可以访问。
示例：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<select id="mySelect" runat="server">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<div id="myDiv" runat="server"></div>
</form>
</body>
</html>
代码：
foreach ( ListItem item in mySelect.Items )
{
myDiv.InnerHtml += string.Format( "Text = {0}, Value = {1}<br />", item.Text, item.Value );
}
或者：
for ( int i = 0; i < mySelect.Items.Count; i++ )
{
myDiv.InnerHtml += string.Format( "Text = {0}, Value = {1}<br />", mySelect.Items[ i ].Text, mySelect.Items[ i ].Value );
}
asp.net 如何获取html控件select
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转载自blog.csdn.net/Chen_junheng/article/details/4371018
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