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Help with LINQ group by

Posted on 2014-01-24
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Last Modified: 2016-02-10
Hi.
I have the following statement which returns totals by SSN. I need to add another column to the result.  How do I do that?  I want to include the LASTNAME.  Any ideas?

   var query = from rawdata in myTable.AsEnumerable()
                         group rawdata by rawdata.Field<string>("SSN") into grp
                         orderby grp.Key
                         select new
                         {
                             SSN = grp.Key,
                             TOTAL = grp.Sum(r => r.Field<decimal>("SALES"))
                         
                       // WANT TO ADD LASTNAME HERE!
                       // LASTNAME IS A FIELD IN myTable

                           LASTNAME = ????????????????




                         };
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Question by:JElster
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Fernando Soto earned 500 total points
ID: 39806724
Hi  JElster;

This should give you the wanted results.

var query = from rawdata in myTable.AsEnumerable()
            group rawdata by rawdata.Field<string>("SSN") into grp
            orderby grp.Key
            select new
            {
                SSN = grp.Key,
                TOTAL = grp.Sum(r => r.Field<decimal>("SALES")),
                LASTNAME = grp.Select(n => n.Field<string>("LASTNAME")).FirstOrDefault()
            };

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