select from datatable in asp.net

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ok..one other question is ,

I have onedatatable where column is ruleid,descp

and in seconddatatable, i have column hotelid,ruleid

now i want to check

if secondtable.contains hotelid,select ruleid and,if(onedatatable.contains ruleid from seconddatatable,select descp in onedatatable)

i hope u understood..

Posted 30-Jan-14 2:26am

maulikshah1990

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2 solutions

Solution 2

I use

results.SingleOrDefault().amount.ToString() to get amount ...it has solved..

Posted 30-Jan-14 21:40pm

maulikshah1990

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Sergey Alexandrovich Kryukov 10-Mar-14 0:47am

Not an answer.
—SA

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OriginalGriff · Accepted Answer · 2014-01-30T03:01:00

You can do it with Linq:

C#

DataTable dtOne = new DataTable();
dtOne.Columns.Add("ruleid", typeof(int));
dtOne.Columns.Add("descp", typeof(string));
dtOne.Rows.Add(1, "hello");
dtOne.Rows.Add(2, "there");
dtOne.Rows.Add(3, "world");

DataTable dtTwo = new DataTable();
dtTwo.Columns.Add("hotelid", typeof(int));
dtTwo.Columns.Add("ruleid", typeof(int));
dtTwo.Rows.Add(1, 1);
dtTwo.Rows.Add(2, 1);
dtTwo.Rows.Add(3, 2);
dtTwo.Rows.Add(4, 3);
dtTwo.Rows.Add(5, 4);

var results = from rowOne in dtOne.AsEnumerable()
              join rowTwo in dtTwo.AsEnumerable() on rowOne.Field<int>("ruleId") equals rowTwo.Field<int>("ruleid")
              where rowTwo.Field<int>("hotelid") == 3
              select new { hotelid = rowTwo["hotelid"], descp = rowOne["descp"] };