private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.RowIndex > -1)
            {
                if (e.ColumnIndex == 0 || e.ColumnIndex == 1)
                    e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            }
        }