FirstOrDefault.cs

var items = new[] { 1, 2, 3, 4, 5, 2 };
Func<int, bool> predicate = delegate(int i)
    {
        Console.WriteLine(i);
        return i == 2;
    };

//Prints: 1 2
items.Where(predicate).FirstOrDefault();

//Prints: 1 2    
items.FirstOrDefault(predicate);