是gridview吗？

if (e.Row.RowType == DataControlRowType.DataRow)
        {
            View_OPR_Inventory v = (View_OPR_Inventory)e.Row.DataItem;

            if (v.F_PurchasePrice == 0m)
            {
                e.Row.Cells[2].Text = string.Empty;
            }
            if (v.F_Price == 0m)
            {
                e.Row.Cells[3].Text = string.Empty;
            }
            if (v.F_Count == 0m)
            {
                e.Row.Cells[7].Text = string.Empty;
            }

string strTotal = e.Row.Cells[7].Text.ToString().Trim() == "" ? "0" : e.Row.Cells[7].Text.ToString().Trim();
            sum += decimal.Parse(strTotal);
        }

        if (e.Row.RowType == DataControlRowType.Footer)
        {
            e.Row.Cells[0].HorizontalAlign = HorizontalAlign.Left;
            e.Row.Cells[0].Text = "合计";
            e.Row.Cells[7].HorizontalAlign = HorizontalAlign.Right;
            e.Row.Cells[7].Text = sum.ToString("F2");
        }

可以参照这个。