datatable sum column and concatenate rows using LINQ and group by on multiple columns - vb.net

Question

I Have a datatable with following records
ID NAME VALUE CONTENT
1 AAA 10 SYS, LKE
2 BBB 20 NOM
1 AAA 15 BST
3 CCC 30 DSR
2 BBB 05 EFG
I want to write a VB.NET/LINQ query to have a output like below table: -
ID NAME SUM CONTENT (as CSV)
1 AAA 25 SYS, LKE, BST
2 BBB 25 NOM, EFG
3 CCC 30 DSR
Please provide me LINQ query to get the desired result. Thanks.
I have tried concatenation using below query
Dim grouped = From row In dtTgt.AsEnumerable() _
Group row By New With {row.Field(Of Int16)("ID"), row.Field(Of String)("Name")} _
Into grp() _
Select ID, Name, CONTENT= String.Join(",", From i In grp Select i.Field(Of String)("CONTENT"))

Answer 1

This query will give you the expected output:-
Dim result = From row In dt.AsEnumerable()
Group row By _group = New With {Key .Id = row.Field(Of Integer)("Id"),
Key .Name = row.Field(Of String)("Name")} Into g = Group
Select New With {Key .Id = _group.Id, Key .Name = _group.Name,
Key .Sum = g.Sum(Function(x) x.Field(Of Integer)("Value")),
Key .Content = String.Join(",", g.Select(Function(x) x.Field(Of String)("Content")))}

Answer 2

Thanks for your answers.
However, I have managed to get the desired result using simple code (Without LINQ): -
Dim dt2 As New DataTable
dt2 = dt.Clone()
For Each dRow As DataRow In dt.Rows
Dim iID As Integer = dRow("ID")
Dim sName As String = dRow("Name")
Dim sContt As String = dRow("Content")
Dim iValue As Integer = dRow("Value")
Dim rwTgt() As DataRow = dt2.Select("ID=" & iID)
If rwTgt.Length > 0 Then
rwTgt(0)("Value") += iValue
rwTgt(0)("Content") += ", " & sContt
Else
rw = dt2.NewRow()
rw("ID") = iID
rw("Name") = sName
rw("Value") = iValue
rw("Content") = sContt
dt2.Rows.Add(rw)
End If
Next