Comparing things in lists?

[RustyDoorknobs]

Hello, I'm new to csharp and was wondering about something. How can I check to see if two lists share a value? For example:

List<int> list1 = new List<int>();
List<int> list2 = new List<int>();

list1.Add(1);
list1.Add(5);
list1.Add(3);

list2.Add(4);
list2.Add(1);
list2.Add(9);
list2.Add(2);

As you can see, both the lists have the number 1. How can I check this in csharp, if the lists can be any length?

[tlhintoq]

Nested loops.
You loop through all of the indexes of List1 and compare each item to all of the indexes in List2

Foreach (int Yogi in List1)
{
   Foreach (int BooBoo in List2)
   {
      if (List1[Yogi] == List2[BooBoo])
      {
         // We have a winner Ranger Smith
      }
   }
}

[Curtis Rutland]

A slightly more condensed version:

foreach (int i in intList1)
    if (intList2.Contains(i))
        Console.WriteLine("Both lists contain: {0}", i);