Ivan

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace array10x10
{
    class Program
    {

        static void Main(string[] args)
        {
            int maxValue = int.MinValue;
            int saveX = 0;
            int saveY = 0;
            int[,] array = {
                {1,2,3,4,5,355,2,5,7,4},
                {5,5,8,3,4,3,5,6,4,3},
                {9,553,7,4,4,2,5,6,3,5},
                {3,5,5,4,8,9,4,665,7,4},
                {4,6,8,445,7,5,6,3,6,4},
                {4,6,7,4,6,7,6,6,4,6},
                {6,5,3,5,3,5,3,6,3,1},
                {6,5,5,5,3,5,3,6,3,1},
                {5,5,8,3,4,3,5,6,555,3},
                {3,5,5,6,8,5,999,6,8,9} };

            for (int i = 0; i != array.GetLength(0); i++)
            {
                for (int j = 0; j != array.GetLength(1); j++)
                {
                    if (array[i, j] > maxValue)
                    {
                        maxValue = array[i, j];
                        saveX = i;
                        saveY = j;
                    }
                }
            }
            array[saveX, saveY] = 0;
            for (int i = 0; i != array.GetLength(0); i++)
            {
                for (int j = 0; j != array.GetLength(1); j++)
                {

                        Console.Write(array[i, j]);

                }
                Console.WriteLine();
            }
            Console.SetCursorPosition(0, 12);
            Console.WriteLine(maxValue);
        }

    }

}