ArrayList下的迴圈綁定和迴圈刪除

1:綁定下拉式功能表       
       ArrayList ids = new ArrayList();
       DataAccess.adminAccess login = new DataAccess.adminAccess(System.Configuration.ConfigurationManager.AppSettings["connstring"].ToString());
        Data.adminData dsUserInfo = login.Query();
        this.DropDownList1.Items.Clear();
        for (int i = 0; i < dsUserInfo.Tables[0].Rows.Count; i++)
        {

            string id_str = dsUserInfo.Tables[0].Rows[i]["aid"].ToString();
            ids.Add(id_str);

        }
        IEnumerator ienum = ids.GetEnumerator();
        while (ienum.MoveNext())
        {
            this.DropDownList1.Items.Add(new ListItem(ienum.Current.ToString(),"1"));
        }

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2:迴圈刪除

 ArrayList ids = new ArrayList();
        for (int i = 0; i < this.GridView1.Rows.Count; i++)
        {
            CheckBox chk = (CheckBox)GridView1.Rows[i].FindControl("CheckAll");
            if (chk.Checked)
            {
                string id_str = this.GridView1.DataKeys[i].Value.ToString();
                Guid id = new Guid(id_str);
                ids.Add(id);
            }
        }
        IEnumerator ienum = ids.GetEnumerator();
        while (ienum.MoveNext())
        {
            DeleteID((Guid)ienum.Current);//執行刪除函數
        }
        ShowAll();