public partial class RunWebIDApp : Form
    {
        public RunWebIDApp()
        {
            InitializeComponent();
        }

        private void btn_run_Click(object sender, EventArgs e)
        {
            IList<myApp> list = new List<myApp>();
            SqlConnection conn = new SqlConnection("server=.;uid=xiaoyi;pwd=123;database=CNKI");
            SqlCommand comm = new SqlCommand("select svrUrl,svrAutoID from svr_Info", conn);
            conn.Open();
            using (SqlDataReader rdr = comm.ExecuteReader())
            {
                while (rdr.Read())
                {
                    myApp app = new myApp();
                    app.url = rdr.GetString(0);
                    app.autoID = rdr.GetInt32(1);
                    list.Add(app);
                }
            }
            foreach (myApp myapp in list)
            {
                comm.CommandText = string.Format("update classLink set webID={0} where svrUrl='{1}'", myapp.autoID, myapp.url);
                int i = comm.ExecuteNonQuery();
                this.tbx_show.Text += myapp.url + "==>" + i.ToString();
                this.tbx_show.Focus();
                this.tbx_show.Select(this.tbx_show.TextLength, 0);
                this.tbx_show.ScrollToCaret();
                Application.DoEvents();
            }
            conn.Close();
            MessageBox.Show("OK,Done!");
        }

    }

    public struct myApp
    {
        public string url;
        public int autoID;
    }

list有2000多条数据

classLink表中有8000多数据

按说应该跑的很快的呀

怎么越跑越慢，到现在2秒动一下

程序有什么问题？大虾给看看