dataGridView控件DateTime列插入DateTimePicker

public Form1()
        {
            InitializeComponent();
        }

        //定义一个DateTimePicker控件
        private DateTimePicker dTimePicker = new DateTimePicker();

        //定义一个DataSet
        private DataSet ds;
       
        private void Form1_Load(object sender, EventArgs e)
        { 
            //隐藏dTimePicker
            dTimePicker.Visible = false;
            
            //dataGirdView1控件数据绑定
            Data_Bind();


            //定义控件dTimePicker当Text变更时委托于事件dTimePicker_TextChanged
            dTimePicker.TextChanged += new EventHandler(dTimePicker_TextChanged);

            //dataGridView1添加控件dTimePicker
            dataGridView1.Controls.Add(dTimePicker);
        }

        /**//**//**//// <summary>
        /// dataGirdView绑定数据
        /// </summary>
        private void Data_Bind()
        {
            string sqlstr = "select businessname,lastlogindate from business";
            ds = SqlHelper.ExecuteDS(CommandType.Text, sqlstr);
            dataGridView1.DataSource = ds.Tables[0].DefaultView;
        }


        //事件dTimePicker_TextChanged,当dTimePicker当Text变更时触发
        private void dTimePicker_TextChanged(object sender, EventArgs e)
        {
            //把dTimePicker的Text值赋给dataGridView1选中的单元格值
            dataGridView1.CurrentCell.Value = dTimePicker.Text;
        }
        
        private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
        {
            //当dataGridView1滚动条移动时dTimePicker控件隐藏
            dTimePicker.Visible = false;
        }

        private void dataGridView1_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e)
        {
            //当dataGridView1的列宽改变时dTimePicker控件隐藏
            dTimePicker.Visible = false;

        }

        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            //判断选中行时日期类型
            //dt = ds.Tables[0];
            Type t = ds.Tables[0].Columns[dataGridView1.CurrentCell.ColumnIndex].DataType;
            DateTime d = DateTime.Now;
            if (t== d.GetType() )
            {
                //获得dataGridView1选中单元格显示区域的矩形
                Rectangle Rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, false);
                //显示dTimePicker在dataGridView1选中单元格显示区域的矩形里面,即选中单元格内
                dTimePicker.Visible = true;
                dTimePicker.Top = Rect.Top;
                dTimePicker.Left = Rect.Left;
                dTimePicker.Height = Rect.Height;
                dTimePicker.Width = Rect.Width;
                //dTimePicker控件获取初始值为dataGridView1选中单元格值
                dTimePicker.Text=dataGridView1.CurrentCell.Value.ToString();

            }
        }