private void button4_Click(object sender, EventArgs e)
{
DataDAO dataDAO = new DataDAO();
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
if (dataGridView1.Rows[i].Cells[9].Value != null)
{
DialogResult dialogResult = MessageBox.Show("Ban Chac Chan Xoa !", "Xoa", MessageBoxButtons.YesNo);
switch (dialogResult)
{
case DialogResult.Yes:
dataDAO.Delete(dataGridView1.Rows[i].Cells[0].Value.ToString());
break;
case DialogResult.No:
break;
}
}
}
}