Difference between two lists

Question

I Have two generic list filled with CustomsObjects.

I need to retrieve the difference between those two lists(Items who are in the first without the items in the sec

Answer 1

here is my solution:

    List list1 = new List();

    List list2 = new List();

    List exceptValue = new List();

foreach(String L1 in List1) 
{
    if(!List2.Contains(L1)
    {
         exceptValue.Add(L1);
    }
}
foreach(String L2 in List2) 
{
    if(!List1.Contains(L2)
    {
         exceptValue.Add(L2);
    }
}