Question

I have a datatable with a column “No” and “Total” column. I’d like to bring back the sum of the “Total” column for each “No”. I’ve tried the below, but I’m getting several errors as I’m struggling with the syntax.

var Values =
        (from data in DtSet.Tables["tblDetails"].AsEnumerable()
         group data by data.Field<"No">
         select new
         {
             name_1 = data.Field<double>("No"),
             name_2 = data.Field<double>("Total"),
         }
         );   

Answer 1

This will give you sum of Total fields in name_2 property, and grouping No in name_1 property (I think you need better naming here)

var Values = from row in DtSet.Tables["tblDetails"].AsEnumerable()
             group row by row.Field<double>("No") into g
             select new
             {
                 name_1 = g.Key,
                 name_2 = g.Sum(r => r.Field<double>("Total"))
             };

Consider about names No and TotalSum instead.