Program.cs

    class Program
    {
        static void Main(string[] args)
        {
            var array = new int[] { 1, 2, 3, 4, 5, 6, 7 };
            foreach (var item in GetQuarterFromMiddle(array))
            {
                Console.WriteLine(item);
            }
        }

        static int[] GetQuarterFromMiddle(int[] _myArray)
        {
            return _myArray
              .Skip(_myArray.Length / 2)
              .Take(_myArray.Length / 4)
              .ToArray();
        }
    }