异步Ado.Net操作

如何在select 数据库的时候设置进度条？？这问题搞了我一下午，最后还是发现异步Ado.Net比较简单好用。
又学了一招

Winform，一看就知道了，就那几个控件。。。不说了。

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

namespace  AsynchronousAdoNet
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            toolStripProgressBar1.Enabled = false;
        }

        public void BindDate()
        {
            //执行异步操作时，连接字符串中必须启用Asynchronous Processing
            string strConnection = "Data Source=.;Initial Catalog=AdventureWorks;" +
                                   "Integrated Security=True;Asynchronous Processing=True";

            string strQuery = "SELECT ProductCategory_1.*, Production.ProductCategory.*" +
                              "FROM Production.ProductCategory INNER JOIN " +
                              "Production.ProductCategory AS ProductCategory_1 ON " +
                              "Production.ProductCategory.ProductCategoryID = " +
                              "ProductCategory_1.ProductCategoryID";

            using (SqlConnection conn = new SqlConnection(strConnection))
            {
                SqlCommand comm = new SqlCommand(strQuery, conn);
                IAsyncResult asyncResult = null;//表示异步操作的状态
                try
                {
                    conn.Open();
                    asyncResult = comm.BeginExecuteReader(CommandBehavior.CloseConnection);
                    
                    toolStripProgressBar1.Enabled = true;
                    toolStripStatusLabel1.Text = "Processing";

                    while (!asyncResult.IsCompleted)//判断异步操作是否完成
                    {
                        //Maximun = 100,Minimun = 0,Step = 10,Style = Blocks
                        if (toolStripProgressBar1.Value == toolStripProgressBar1.Maximum)
                            toolStripProgressBar1.Value = toolStripProgressBar1.Minimum;

                        toolStripProgressBar1.PerformStep();
                    }
                    SqlDataReader reader = comm.EndExecuteReader(asyncResult);
                    DataTable dtResult = new DataTable();
                    dtResult.Load(reader);

                    if (dtResult != null)
                        dataGridView1.DataSource = dtResult;

                    //设置进度条，文字
                    toolStripProgressBar1.Value = toolStripProgressBar1.Maximum;
                    toolStripProgressBar1.Enabled = false;
                    toolStripStatusLabel1.Text = "Completed";
                        
                }
                catch(Exception e)
                {
                    MessageBox.Show(e.Message);
                }

            }
        }

        private void btnGetDate_Click(object sender, EventArgs e)
        {
            BindDate();
        }
    }
}