Asp.Net。从数据集中查找最小日期

我想从数据集中获取最短日期，但代码在不同时间没有给出最短日期。。请给我提个建议

Report.StartDate = DateTime.Parse(ds.Tables[0].Compute("MIN([" + c.ColumnMap + "])", "").ToString());

请尝试以下代码-

 DateTime minDate = DateTime.MaxValue;
    DateTime maxDate = DateTime.MinValue;
    foreach (string dateString in StringDates)
    {
        DateTime date = DateTime.Parse(dateString);
        if (date < minDate)
            minDate = date;
        if (date > maxDate)
            maxDate = date;
    }

 //Retrieve Minimum Date
    var MinDate = (from d in dataRows select d.Date).Min();

    //Retrieve Maximum Date
    var MaxDate = (from d in dataRows select d.Date).Max();