public void HienThi()
 {
     dataGridView1.DataSource = sp.ShowSanPham("");
     for (int i = 0; i < dataGridView1.RowCount - 1; i++)
     {
         dataGridView1.Rows[i].Cells[0].Value = (i + 1).ToString();
     }
     Init();
 }
        public void HienThi()
        {
            dgvSP.DataSource = sp.ShowSanPham("");

            for (int i = 0; i < dgvSP.RowCount - 1; i++)
            {
                dgvSP.Rows[i].Cells[0].Value = (i + 1).ToString();
            }
        }