C# Part II Arrays Exercise 6

using System;

class MaxSum
{
    static void Main()
    {
        int maxElement = int.MinValue;
        int index = 0;
        uint arrayLength = 0;
        int maxSum = 0;

        Console.Write("Enter the arrays's length: ");

        while (!uint.TryParse(Console.ReadLine(), out arrayLength))
        {
            Console.Write("Invalid input. Enter a positive integer number: ");
        }

        int elementsCount = 0;

        Console.Write("Enter the count of the elements to be summed: ");

        while (!int.TryParse(Console.ReadLine(), out elementsCount) || elementsCount > arrayLength)
        {
            Console.Write("Invalid input. Enter a positive integer number: ");
        }

        int[] array = new int[arrayLength];

        for (int i = 0; i < arrayLength; i++)
        {
            Console.Write("Enter the {0} element of the  array: ", i);

            while (!int.TryParse(Console.ReadLine(), out array[i]))
            {
                Console.Write("Invalid input. Enter an integer number: ");
            }
        }

        int[] maxElements = new int[elementsCount];

        for (int i = 0; i < elementsCount; i++)
        {
            for (int j = 0; j < array.Length; j++)
            {
                if (array[j] > maxElement)
                {
                    maxElement = array[j];
                    index = j;
                }
            }
            maxElements[elementsCount - 1 - i] = maxElement;
            maxSum += maxElements[elementsCount - 1 - i];
            maxElement = int.MinValue;
            array[index] = int.MinValue;
        }

        Console.WriteLine("The maximal sum of {0} elements is the sum of the elements {1}, which is {2}.", elementsCount, string.Join(", ", maxElements), maxSum);
    }
}