>I have this command to select only the groups from a datatable:
>
>

>' Group
>loResult = loDataTable.AsEnumerable().GroupBy(Function(r) r.Field(Of Integer)(lcPrimaryKey)).[Select](Function(g) g.First()).CopyToDataTable
>

>
>I just found out that this will generate an error if one of the values is a null.
>
>Is there a way I can add support in this command for such situation?

See you no longer need it but this should work:

loResult = loDataTable.AsEnumerable().GroupBy(Function(r) r.Field(Of System.Nullable(Of Integer))(lcPrimaryKey)).[Select](Function(g) g.First()).CopyToDataTable