var intList = new int[] { 1, 2, 3, 4, 5, -1, -2 };Console.WriteLine("Where");foreach (var i in intList.Where(x => x <= 3))    Console.WriteLine(i);Console.WriteLine("TakeWhile");foreach (var i in intList.TakeWhile(x => x <= 3))    Console.WriteLine(i);

Where123-1-2TakeWhile123