Help with LINQ groyuping by multiple columns

Hi,, need some guidance in vb.net linq
i have a data table with the following columns

ItemCode, ItemDescription,Height,Width,Quantity, Price

need to group rows by Description, height and width and sum the quantity

attempted this :confused::confused:

Code:

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Dim q = From tbl In ocom.ds.Tables("table").AsEnumerable()
        '        Group tbl By tbl.Field(Of String)("ItemDescription"), tbl.Field(Of Decimal)("w"), tbl.Field(Of Decimal)("H") Into Comps()

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try this:

Code:

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Dim q = (From row In ocom.ds.Tables("table").AsEnumerable() _
                Group row By i = row.Field(Of String)("ItemCode"), _
                d = row.Field(Of String)("ItemDescription"), _
                w = row.Field(Of Decimal)("Width"), _
                h = row.Field(Of Decimal)("Height"), _
                p = row.Field(Of Decimal)("Price") _
                Into Group _
                Select New With { _
                .ItemCode = i, _
                .ItemDescription = d, _
                .Height = h, _
                .Width = w, _
                .Quantity = Group.Sum(Function(r As DataRow) r.Field(Of Integer)("Quantity")), _
                .Price = p}).Tolist

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