DropDownList

Hej jeg har en DropDownList, hvor jeg hendte data fra en database og sited denne data ind i min DropDownList. Nu er mit problem, at jeg ikke kan, få data ud at DropDownList igen?

Har er min kode:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace dbtest2_med_objekt
{
    /// <summary>
    /// Summary description for WebForm2.
    /// </summary>
    public class WebForm2 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
        protected System.Web.UI.WebControls.Button Button1;
        protected System.Web.UI.WebControls.Label Label1;
        protected String ud;
   
        private void Page_Load(object sender, System.EventArgs e)
        {
            Datastore ds = new Datastore();
            string sql = "SELECT * FROM test1";

            DataSet dt = ds.GetDataSet(sql);

            DropDownList1.DataSource = dt;
            DropDownList1.DataTextField="navn";
            DropDownList1.DataValueField="link";
            DropDownList1.DataBind();

        }

        #region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
       
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {   
            this.DropDownList1.SelectedIndexChanged += new System.EventHandler(this.DropDownList1_SelectedIndexChanged);
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void Button1_Click(object sender, System.EventArgs e)
        {
           
            Label1.Text=ud;
           
            //Response.Redirect(DropDownList1.DataTextField);
        }

        private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            ud =DropDownList1.DataValueField;
            Label1.Text=ud;

        }
    }
}