ДЗ Наибольший элемент

using System;

namespace CSLight
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Random random = new Random();
            int minValue = -20;
            int maxValue = -1;

            int[,] numbers = new int[10, 10];
            int largestNumber;
            int overwriteValue = 0;

            Console.WriteLine("Первоначальная матрица:");

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    numbers[i, j] = random.Next(minValue, maxValue + 1);

                    Console.Write(numbers[i, j] + " ");
                }

                Console.WriteLine();
            }

            largestNumber = numbers[0, 0];

            foreach (int number in numbers)
            {
                if (number > largestNumber)
                {
                    largestNumber = number;
                }
            }

            Console.WriteLine("Измененная матрица:");

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    if (numbers[i, j] == largestNumber)
                    {
                        numbers[i, j] = overwriteValue;
                    }

                    Console.Write(numbers[i, j] + " ");
                }

                Console.WriteLine();
            }

            Console.WriteLine("Наибольшее число : " + largestNumber);
            Console.ReadLine();
        }
    }
}