在dataGridView中实现批量删除

dataGridView设计如下图：


代码如下：

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

namespace test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        LinkDB linkdb = new LinkDB();
        string strSelectAll = "select * from tb1";
        string strTable = "tb1";
        DataSet ds = new DataSet();
        private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.AllowUserToAddRows = false;
            dataGridView1.AlternatingRowsDefaultCellStyle.BackColor = Color.Azure;
            ds = linkdb.QueryDB(strSelectAll, strTable);
            dataGridView1.DataSource = ds;
            dataGridView1.DataMember = strTable;
        }

        bool blIsSelectAll = false;
        private void btnSelectAll_Click(object sender, EventArgs e)
        {
            //写法1
            //if (dataGridView1.Rows.Count > 0)
            //{
            //    for (int i = 0; i < dataGridView1.Rows.Count; i++)
            //    {
            //        dataGridView1[0, i].Value = true;
            //    }
            //}
            //blIsSelectAll = true;
            //return;

            //写法2
            foreach (DataGridViewRow dr in dataGridView1.Rows)
            {
                ((DataGridViewCheckBoxCell)dr.Cells[0]).Value = true;
            }
            blIsSelectAll = true;
            return;
        }

        private void btnCancelAll_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow dr in dataGridView1.Rows)
            {
                ((DataGridViewCheckBoxCell)dr.Cells[0]).Value = false;
            }
            blIsSelectAll = false;
            return;
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            try
            {
                if (dataGridView1.Rows.Count > 0)
                {
                    if (blIsSelectAll) //全选：进行批量删除
                    {
                        for (int rowIndex = 0; rowIndex < ds.Tables[strTable].Rows.Count; rowIndex++)
                        {
                            ds.Tables[strTable].Rows[rowIndex].Delete();//逻辑性删除（从数据集ds中删除）
                            //物理性删除（从DB中删除）
                        }
                    }
                    else  //删除所选择的行
                    {
                        List<DataGridViewRow> tmpList = new List<DataGridViewRow>();
                        for (int j = 0; j < dataGridView1.Rows.Count; j++)
                        {
                            if (Convert.ToBoolean(dataGridView1[0, j].EditedFormattedValue.ToString()))
                            {
                                tmpList.Add(dataGridView1.Rows[j]);
                            }
                        }
                        for (int i = 0; i < tmpList.Count; i++)
                        {
                            dataGridView1.Rows.Remove(tmpList[i]);
                        }
                        tmpList = null;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            blIsSelectAll = false;
        }

        private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            SolidBrush b = new SolidBrush(Color.Black);
            e.Graphics.DrawString(Convert.ToString(e.RowIndex + 1), e.InheritedRowStyle.Font, b, e.RowBounds.X + 15, e.RowBounds.Y + 1);
        }   
    }
}