C# 释放资源问题

Question

有系列一段代码：           while (sdr.Read()) {
                try
                {
                    IPAddress[] ips = Dns.GetHostAddresses(sdr[1].ToString());
                    foreach (IPAddress ip in ips)
                    {
                        richTextBox1.Text = richTextBox1.Text + "\n" + sdr[0].ToString() + "," + sdr[1].ToString() + "," + ip.ToString();
                    }
                }
                catch (Exception es) {
                    richTextBox1.Text = richTextBox1.Text + "\n" + sdr[0].ToString() + "," + sdr[1].ToString() + "   出错了。";
                }            }因为数据量比较大，所以在执行的时候程序处于假死状态，这样的虚幻怎样能让他，看到一条一条的往上加，而不假死呢？

Answer 1

加上
Application.DoEvents();

Answer 2

        private void button1_Click(object sender, EventArgs e)
        {
            Thread thr = new Thread(new ThreadStart(TestRun));
            thr.IsBackground = true;
            thr.Start();
        }
        
        private void TestRun()
        {
            while (sdr.Read())
            {
                //Thread.Sleep(1);
                try
                {
                    IPAddress[] ips = Dns.GetHostAddresses(sdr[1].ToString());
                    foreach (IPAddress ip in ips)
                    {
                        SetMsg(sdr[0].ToString() + "," + sdr[1].ToString() + "," + ip.ToString());
                    }
                }
                catch (Exception es)
                {
                    SetMsg(sdr[0].ToString() + "," + sdr[1].ToString() + "   出错了。");
                }
            }
        }        private void SetMsg(string str)
        {
            this.Invoke(new MethodInvoker(delegate
            {
                richTextBox1.AppendText("\r\n" + str);
            }));
        }