Group newly made parameter values in linq to sql - asp.net

Question

I am trying to group newly made key values but i'm not getting it to work.
This is the code
Dim result = From v In dc.tbl_voertuigs
Join tv In dc.tbl_type_voertuigs On tv.pk_type_voertuig Equals v.fk_type_voertuig
Join tbc In dc.tbl_tebehalencertificaats On tbc.pk_tebehalencertificaat Equals v.fk_tebehalencertificaat
Where tbc.naam_certificaat = subquery2
Select New Voertuig With
{
.p_voertuigid = v.fk_type_voertuig,
.p_voertuigomschr = tv.type + " -- " + tv.merk
}
I would like to group on .p_voertuigid. I already tried some options without any result. I hope someone here can help me.
Thanks in advance!
I think i am almost there, but now i'm getting a new exception:
Value of type system.collections.generic.list(of <anonymoustype>) cannot be converted
to system.collections.generic.list(of tbl_voertuig)
This is my new code
Dim result = (From v In dc.tbl_voertuigs
Join tv In dc.tbl_type_voertuigs On tv.pk_type_voertuig Equals v.fk_type_voertuig
Join tbc In dc.tbl_tebehalencertificaats On tbc.pk_tebehalencertificaat Equals v.fk_tebehalencertificaat
Where tbc.naam_certificaat = subquery2
Group By v = New Voertuig With
{
.p_voertuigid = v.fk_type_voertuig,
.p_voertuigomschr = tv.type + " -- " + tv.merk
} Into grp = Group).ToList
Return result

Answer 1

I found the answer, this is the final code and it works
Dim result = From v In dc.tbl_voertuigs
Join tv In dc.tbl_type_voertuigs On tv.pk_type_voertuig Equals v.fk_type_voertuig
Join tbc In dc.tbl_tebehalencertificaats On tbc.pk_tebehalencertificaat Equals v.fk_tebehalencertificaat
Where tbc.naam_certificaat = subquery2
Group By v = New Voertuig With
{
.p_voertuigid = v.fk_type_voertuig,
.p_voertuigomschr = tv.type + " -- " + tv.merk
} Into grp = Group _
Select v
Return result.ToList
I hope this can help someone who has the same problem in the future
Grtz
Yannick