Can't Sum MULTUPLE ROWS according to date in excel

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Hello, i should sum rows where i have same date.

I used this Linq in Assign

(From p In OutDT1.AsEnumerable() Group p By obj_p = New With {Key.P_TK=P.item(“Дата закрытия”)} Into MG = Group Select New With {.Tk=obj_p.P_TK,.Zakr=MG.Sum(Function(r) Double.Parse(r.item(“Объем открытия”).ToString())),.Otkr=MG.Sum(Function(r) Double.Parse(r.item(“Объем закрытия”).ToString()))}).ToList
and join
String.Join(“,”,Inem(0).ToString.Split(“,“c).Select(Function(item) item.ToString.Split(”=“c)(0).Replace(”{”,“”).Trim))+System.Environment.NewLine+ String.Join(System.Environment.NewLine,Inem.Select(Function(row) String.Join(“,”,row.ToString.Split(“,“c).Select(Function(item) item.ToString.Split(”=“c)(1).Replace(”}”,“”).Trim.ToString))))

then used a generate DataTable, it is summed to me rows, but last one is not! Can anyone help.