using linq not exists vb.net

HI,

I have the following function that I cant quite get right as am still relatively new to linq:

Basically the costume group that is being passed in has a property costumes

The generalhelper.costumes returns a linq.tables(of costumes), the same as the costumes property on group.

What I want to say is get the generalhelper.costumes that dont exist in group.costumes.

How dod I do this.

Can the code be in vb.net please.

Thanks

Public Function GetCostumesNotLinkedToGroup(ByVal group As CostumeGroup) As ....
        Try
            Dim query = GeneralHelper.Costumes.Where....
            Return query
        Catch ex As Exception
            Throw
        End Try
    End Function

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