问在Datagridview上计算？

EN

        private void button1_Click(object sender, EventArgs e)
    {
        //skip last emtpy line(if don't have, remove -1)
        for (int i = 1; i < dataGridView1.Rows.Count - 1; i++)
        {
            int valueCellIndex = 0;//assume calculate the 0th column
            int resultCellIndex = 1;//assume result to put into the 1th column
            //assume values are integers
            var lastRow = dataGridView1.Rows[i - 1];
            var curRow = dataGridView1.Rows[i];
            int last = Convert.ToInt32(lastRow.Cells[valueCellIndex].Value);
            int cur = Convert.ToInt32(curRow.Cells[valueCellIndex].Value);
            curRow.Cells[resultCellIndex].Value = cur - last;
        }
    }