Enumerable.Intersect produces the set intersection of two sequences
Imports System Imports System.Linq Imports System.Collections.Generic Public Class Example Public Shared Sub Main() Dim id1() As Integer = {4, 6, 2, 0, 1, 8} Dim id2() As Integer = {9, 9, 3, 7, 6, 4, 0} Dim intersection As IEnumerable(Of Integer) = id1.Intersect(id2) For Each id As Integer In intersection Console.WriteLine(id) Next End Sub End Class