线程定时刷新主界面导致tomcat连接池报错，请问怎么解决呢？

        private void Frm_Load(object sender, EventArgs e)

        {

            flashThread = new Thread(new ThreadStart(this.flash_doing));

            flashThread.Name = "刷新";

            flashThread.IsBackground = true;

            flashThread.Start(); //启动线程

        }



        private void flash_doing()

        {

           

            while (true)

            {

                StartFlash();

                System.Threading.Thread.Sleep(15*1000);  //测试15秒刷新一次

            }

        }





        private void StartFlash()

        {

            if (this.InvokeRequired)

            {

                doCallback d = new doCallback(ShowFrm);

                this.Invoke(d);

            }

            

        }



        private void ShowFrm()

        {

            //刷新页面

        }