Test.aspx
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>DropDownList</title>
    <script src="http://www.biletbilet.com/Templates/js/jquery.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#ddlSonuc").html($('#<%=ddl.ClientID %> option:selected').text());
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:DropDownList ID="ddl" runat="server"></asp:DropDownList>
        <div id="ddlSonuc"></div>
    </form>
</body>
</html>
Test.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int don = 5;
        for (int i = 1; i < don; i++)
        {
            ddl.Items.Add(new ListItem("Deneme Value " + i + " ", "" + i + ""));
        }
    }
}