private void buttonDelete2_Click(object sender, EventArgs e)
        {
            c.id = int.Parse(textSearch.Text);
            bool success = c.DeleteGroups(c);

            if (success = true)
            {
                MessageBox.Show("Record Deleted.....");
            }
            else if (success = false)
            {
                MessageBox.Show("Record is not deleted.....");
            }
            DataTable dt = c.Select();

            dataGridViewGroups.DataSource = dt;
        }