datagridview添加复选框全选和取消

全选

private void All_selected_Click(object sender, EventArgs e)
        {            
            for (int i = 0; i < this.DataGridViewProduct.Rows.Count; i++)
            {
                if (DataGridViewProduct.Rows[i].Cells["Check"].EditedFormattedValue.ToString().ToLower()=="false")
                {
                    DataGridViewProduct.Rows[i].Cells["Check"].Value = "True";
                }
            }            
        }

取消

 public void AllCancel()
        {
            foreach (DataGridViewRow row in DataGridViewProduct.Rows)
            {
                row.Selected = false;
            }
        }