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How to find max value of a column in a datatable?

Posted by  Mark Devid
C# 
C#
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I am trying to find the max value of a column in a datatable.

 Below is my code:-

var maxVal = dsloadReferralCodes.Tables["dtReferralCodesTable"].AsEnumerable().Max(r =>  Convert.ToBoolean(int.TryParse(r.Field<string>("ROWNUM"), out intROWNUM)) ? (int?)intROWNUM : null);

and below id the error i am getting while trying to get the max value and assigning it to intROWNUM

Unable to cast object of type 'System.Decimal' to type 'System.String'

Can someone help me in resolving the issue. This has been troubling me since long.

Thanks in advance...

  1. Re: How to find max value of a column in a datatable?

    Hi Mark,

    You can get it in simple manner with DataTable.Select() :

    DataRow [] dr =dsloadReferralCodes.Tables["dtReferralCodesTable"].Select("ROWNUM=
    MAX(ROWNUM)");  
     if(dr !=null)
        {
         // Console.WriteLine(dr[0]["RowNum"]);
            int maxVal=Convert.ToInt32(dr[0]["RowNum"]);
        }

      Modified On Apr-04-2018 01:58:08 AM

Answer