Add element at any position in Array using C#

private static void Main(string[] args)
{
    int position = -1;
    //Arrays
    int[] numbers = new[] {1, 5, 2, 3, 6, 7};

    //add elements in to array
    Console.WriteLine("Size of array is {0}", numbers.Length);

    //Add element at the end of the array
    //1. Resize it
    //2. Add the number at the last number
    Array.Resize(ref numbers, numbers.Length + 1);
    numbers[numbers.Length - 1] = 9;
    //print it
    Console.WriteLine("New Element is {0}", numbers[numbers.Length - 1]);

    foreach (var num in numbers)
    {
        Console.WriteLine(num);
    }
    //add an element at nth Position
    position = 5;
    AddElementAtPosition(ref numbers, position, 18);

    Console.WriteLine("\n");
    Console.WriteLine("New Element added at position {0} is {1}", position, numbers[1]);
    foreach (var num in numbers)
    {
        Console.WriteLine(num);
    }

    Console.ReadKey();
}

/// <summary>
/// Add element at nth position in array
/// </summary>
/// <param name="numbers">Source Array</param>
/// <param name="position">Position Number</param>
/// <param name="valueToEnter">the value to be entered</param>
private static void AddElementAtPosition(ref int[] numbers, int position, int valueToEnter)
{
    //index at which item has to be added
    var index0 = position - 1;
    //first resize it
    Array.Resize(ref numbers, numbers.Length + 1);

    int orginalLength = numbers.Length;
    //clone the array
    int[] cloneArray = (int[]) numbers.Clone();
    for (int i = 0; i < orginalLength - 1; i++)
    {
        if (i == index0)
        {
            //copy element from the position
            var element = numbers[index0];
            cloneArray[index0] = valueToEnter;
            cloneArray[position] = element;
        }
        else if (i > index0)
        {
            cloneArray[i + 1] = numbers[i];
        }
        else
        {
            cloneArray[i] = numbers[i];
        }
    }
    //reclone and ret
    numbers = (int[]) cloneArray.Clone();
}