如何实现DataGridView实时更新数据

主要控件有 datagridview checkbox picturebox trackBar1 label 
datagridview :实时显示数据
checkbox ：指示是否停止更新
picturebox :显示更新状态
trackBar1 :设置更新时间频率
label :显示一些相关信息

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WinMilkProject.Project
{

    public partial class Form1 : Form
    {
        Thread myThread;
        OperateCB operatedb = new OperateCB();
        public int frequency = 0;//更新时间频率
        public static bool isUse = false;//是否停止更新
        public static string statusInfo = string.Empty;//状态
        private delegate void myDelegate(DataTable dt);//定义委托
        public Form1()
        {
            InitializeComponent();
            label2.Text = "更新频率为:" + (trackBar1.Value / 1000).ToString() + "秒";
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            myThread = new Thread(startFillDv);//实例化线程
            myThread.Start();

        }

        private void startFillDv()
        {
            while (true)
            {
                if (isUse)
                {
                    statusInfo = "正在实时更新数据......";      
                    DataTable dt = operatedb.MyDataTable("select * from test1");//把自己写的数据封装类OperaterCB 能够返回一个datatable
                    Grid(dt);
                    Thread.Sleep(frequency);
                }
                else
                {
                    statusInfo = "停止更新!";
                }
            }

        }

        private void Grid(DataTable dt)
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new myDelegate(Grid), new object[] { dt });
            }
            else
            {
                try
                {
                    this.dataGridView1.DataSource = null;
                    this.dataGridView1.DataSource = dt;
                    dt = null;
                    statusInfo = "更新完成!";
                }
                catch 
                {
                    
                }
            }

        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (this.myThread.IsAlive)
            {
                this.myThread.Abort();//结束线程
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            label1.Text = statusInfo;
            frequency = trackBar1.Value;
            if (statusInfo.Trim() == "正在实时更新数据......")
            {
                pictureBox1.Visible = true;
            }
            else
            {
                pictureBox1.Visible = false;
            }

        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                isUse = true;
            }
            else
            {
                isUse = false;
            }

        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            label2.Text = "更新频率为:" + (trackBar1.Value / 1000).ToString() + "秒";
        }

    }
}

效果图如下：