LINQ Query - Sum [with null values Column from Datatable]

[Mahey]

I like to calculate the total to a field [trn_qty] from Dtb1 [Datatable]. For that any ideas...?

My Query is

Dim Numbers = Dtb1.AsEnumerable()
Dim SvQy = (From n In Numbers Select n.Field(Of Decimal)("trn_qty")).Sum()

But Iam not getting any O/P. Also I don't know whether its correct or not... Any better ideas?

Thanks