private void button9_Click(object sender, EventArgs e)
        {
            var bs = new BindingSource {
                DataSource = dataGridView2.DataSource
            };
            var dt   = (DataTable)(bs.DataSource);
            var evlt = new EvaluateQuery(dt);

            evlt.Show();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            var evlt = new EvaluateQuery();

            evlt.Show();
        }