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Linq Group by and SUM of column?

shaprpuff asked:

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I have a datatable of 3 columns.
Category | Product | Counts
--------------------------------
1        |  Tea    | 100
1        |  Cofee  | 102
2        |  Pen    | 23
2        |  Den    | 200
2        |  Wen    | 60
2        |  Gen    | 12
3        |  Tip    | 12
3        |  Gip    | 12
3        |  Dip    | 12


i want to group it by category with LINQ and show the sum of the Counts(column) under Category

e.x.
Category |  Counts
--------------------------------
1        |  202
2        |  295
3        |  36



DataTable MainData = obj.DATA();

        var query = from b in MainData.AsEnumerable()

                   group b by  b.Field<string>("Category")  into Grp
                   let _count =  Convert.ToInt32( Grp.FirstOrDefault().Field<string>("_count")) 
                                 
                  orderby __count descending
                  select new
                         {
                             Category= Grp.Key,
                          Count = _count
                         };


its just counting the rows.
Tags: C#, LINQ

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