Игорь

public void EnterMatrix() {
        Console.Write("Enter the numbers of matrix columns: ");
        COLUMN = int.Parse(Console.ReadLine());
        Console.Write("Enter the numbers of matrix rows: ");
        ROW = int.Parse(Console.ReadLine());

        ARRAY = new int[COLUMN, ROW];
        
        for (int col = 0; col < COLUMN; col++) {
            for (int row = 0; row < ROW; row++) {
                Console.Write("Enter the element of matrix cell[" + (col + 1) + ":" + (row + 1) + "]: ");
                ARRAY [ col , row ] = int.Parse(Console.ReadLine()); // тута ошибка
            }
        }
    }