In Linq doesn’t exists the IN statment. In fact, the ability to filter the values for multiple occurrences not missing, it writes only in a different way, using a different approach. In this case, if you want to filter the results of a LINQ query, showing more than a filter value, it must build a collection of values to extract and use the Contains method of the collection itself. In other words if I want to extract all of a customers named "Rossi" and "Bianchi", I could just use this approach:
Sub Main()
Dim Coll As New List(Of Customer)
Coll.Add(New Customer With {.ID = 1, .FirstName = "Franco", .LastName = "Rossi"})
Coll.Add(New Customer With {.ID = 2, .FirstName = "Gianni", .LastName = "Verdi"})
Coll.Add(New Customer With {.ID = 3, .FirstName = "Lorenzo", .LastName = "Bianchi"})
Coll.Add(New Customer With {.ID = 4, .FirstName = "Gianmaria", .LastName = "Rossi"})
Coll.Add(New Customer With {.ID = 5, .FirstName = "Luca", .LastName = "Bianchi"})
Coll.Add(New Customer With {.ID = 6, .FirstName = "Vittorio", .LastName = "Rossi"})
Coll.Add(New Customer With {.ID = 7, .FirstName = "Filippo", .LastName = "Verdi"})
Dim FilterValue() As String = {"Rossi", "Bianchi"}
Dim Query = Coll.Where(Function(t) FilterValue.Contains(t.LastName))
For Each c As Customer In Query
…
HTH
Alberto