private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.ColumnIndex == 4)
            {
                if (e.Value.ToString() == "c" && e.Value.ToString().Length > 0)
                {
                    // e.Value = string.Empty.PadLeft(e.Value.ToString().Length, '*');
                    e.Value = "已处理";
                }
                else
                {
                    e.Value = "未处理";

                }
            }
            if (e.ColumnIndex == 6)
            {
                if (e.Value.ToString() == "Y" && e.Value.ToString().Length > 0)
                {
                    e.Value = "需要发票";
                }
                else
                {
                    e.Value = "不需要发票";
                }
            }
        }