BiggestElementInArrayByIndexToEnd SortAscAndDecs

using System;

class FindBiggestElementInArray
{
    static void PrintSortedArray(int[] array)
    {
        foreach (var item in array)
        {
            Console.Write(item + " ");
        }
    }
    static int FindBiggestElement(int[] array, int start)
    {
        int indexMax = 0;
        int max = Int32.MinValue;
        for (int i = start; i < array.Length; i++)
        {
            if (array[i] > max)
            {
                max = array[i];
                indexMax = i;
            }
        }
        return indexMax;
    }
    static int[] ChangeElements(int[] array, int firstElement, int secElement)
    {
        int tempElement = array[firstElement];
        array[firstElement] = array[secElement];
        array[secElement] = tempElement;

        return array;
    }
    static int[] SortDescending(int[] array)
    {
        for (int i = 0; i < array.Length; i++)
        {
            ChangeElements(array, FindBiggestElement(array, i), i);
        }
        return array;
    }
    static int[] SortAscending(int[] array)
    {
        SortDescending(array);
        for (int i = 0; i < (array.Length/2); i++)
        {
            ChangeElements(array, array.Length - i - 1, i);

        }
        return array;
    }
    static void Main()
    {
        Console.Write("Enter array lenght: ");
        int arrLenght = int.Parse(Console.ReadLine());
        int[] array = new int[arrLenght];

        for (int i = 0; i < arrLenght; i++)
        {
            array[i] = int.Parse(Console.ReadLine());
        }
        Console.WriteLine("Enter start index");
        int start = int.Parse(Console.ReadLine());
        Console.WriteLine("Biggest number is: {0}", array[FindBiggestElement(array, start)]);

        Console.WriteLine("Press 1 for ascending sort\nPress 0 for descending sort:");
        int typeSort = int.Parse(Console.ReadLine());

        if (typeSort == 1)
        {
            PrintSortedArray(SortAscending(array));
        }
        else
        {
            PrintSortedArray(SortDescending(array));
        }
    }
}