<%@ Page Language="C#" %>
<script language="C#" runat="server">
void Btn_Click(Object sender, EventArgs e) {
Msg.InnerText = "You selected : " + Color.Value;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
<center>
<form id="Form1" action="Default.aspx" method="post" runat="server" >
Color : <select id="Color" runat="server" >
<option value="white" />
<option value="black" />
</select>
<br/>
<input id="Button1" type="Submit" value="Submit"
OnServerClick="Btn_Click" runat="server" />
<br/>
<span id="Msg" runat="server" />
</form>
</center>
</body>
</html>