private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex >= 0)
{
dataGridView1.CurrentCell.Selected = true;
CTSP CT = new CTSP();
CT.ma = int.Parse(dataGridView1.Rows[e.RowIndex].Cells["MaSP"].Value.ToString());
this.Hide();
CT.ShowDialog();
this.Close();
}
}