what is a good way to check (can I use a Lambda =>) if an item is contained in a List of values?

Hello,

perhaps the following would work for you

List<string> mylist1 = new List<string>(new string[] { "element1", "element2", "element3" });
List<string> mylist2 = new List<string>(new string[] { "element1", "element3", "element0" });


var result1 = mylist1.Intersect(mylist2);

if (result1.Count() >0)
{
    foreach (var item in result1)
    {
        Console.WriteLine(item);
    }
    
}

Result

element1
element3

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