private void dataGridView3_CellMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            int      i = dataGridView1.CurrentRow.Index;
            New_Task b = new New_Task(this, i);

            b.Show();
        }
        private void Add_Click(object sender, EventArgs e)
        {
            New_Task a = new New_Task(this);

            a.Show();
        }