?using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default6 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ArrayList arr = new ArrayList();
            arr.Add("中商互聯");
            arr.Add("上海協捷");
            arr.Add("Qq:59716094");
            arr.Add("http://www.ebiz8.com");
            DropDownList1.DataSource = arr;
            DropDownList1.DataBind();

        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Label1.Text = DropDownList1.SelectedValue;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string dr = TextBox1.Text.ToString();
        DropDownList5.Items.Add(dr);
    }
}