Avia Tickets

int selectedIndex = 0;

string[] menu = new string[]
{
	"Book",
	"Settings",
	"Exit"
};

Seat[,] aviaTickets = new Seat[6, 4]
{
	{ new Seat("A1", 50), new Seat("A2", 50), new Seat("A3", 50), new Seat("A4", 50) },
	{ new Seat("B1", 60), new Seat("B2", 60), new Seat("B3", 60), new Seat("B4", 60) },
	{ new Seat("C1", 70), new Seat("C2", 70), new Seat("C3", 70), new Seat("C4", 70) },
	{ new Seat("D1", 80), new Seat("D2", 80), new Seat("D3", 80), new Seat("D4", 80) },
	{ new Seat("E1", 90), new Seat("E2", 90), new Seat("E3", 90), new Seat("E4", 90) },
	{ new Seat("F1", 99), new Seat("F2", 99), new Seat("F3", 99), new Seat("F4", 99) },
};


while (true)
{
	Console.Clear();

	Console.WriteLine("Menu");

	for (int i = 0; i < menu.GetLength(0); i++)
	{
		if (selectedIndex == i)
		{
			Console.ForegroundColor = ConsoleColor.Blue;
			Console.WriteLine($"{i + 1}. {menu[i]} <<<");
		}
		else
		{
			Console.ResetColor();
			Console.WriteLine($"{i + 1}. {menu[i]}");
		}
	}

	ConsoleKeyInfo keyInfo = Console.ReadKey();

	switch (keyInfo.Key)
	{
		case ConsoleKey.UpArrow:
			if (selectedIndex > 0)
			{
				selectedIndex--;
			}
			break;

		case ConsoleKey.DownArrow:
			if (selectedIndex < menu.GetLength(0) - 1)
			{
				selectedIndex++;
			}
			break;

		case ConsoleKey.Enter:
			if (selectedIndex == 0)
			{
				Console.Clear();

				ShowSeats();

				Console.ReadKey();
			}
			else if (selectedIndex == 1)
			{
				Console.Clear();
				Console.WriteLine("Here are some settings");
				Console.ReadKey();
			}
			else if (selectedIndex == 2)
			{
				Console.Clear();
				Console.ResetColor();
				return;
			}
			break;
	}

	Console.ResetColor();

}

void ShowSeats()
{
	int selectedIndexY = 0;
	int selectedIndexX = 0;

	while (true)
	{
		Console.Clear();

		Console.WriteLine("Book");

		for (int i = 0; i < aviaTickets.GetLength(0); i++)
		{
			for (int j = 0; j < aviaTickets.GetLength(1); j++)
			{
				if (i == selectedIndexY && j == selectedIndexX)
				{
					if (aviaTickets[i, j].IsBooked)
					{
						Console.ForegroundColor = ConsoleColor.Magenta;
					}
					else
					{
						Console.ForegroundColor = ConsoleColor.Green;
					}
				}
				else
				if (aviaTickets[i, j].IsBooked)
				{
					Console.ForegroundColor = ConsoleColor.Red;
				}
				else
				if (aviaTickets[i, j].IsSelected)
				{
					Console.ForegroundColor = ConsoleColor.Yellow;
				}
				else
				{
					Console.ResetColor();
				}

				Console.Write($" [{aviaTickets[i, j].Name}] ");
			}

			Console.WriteLine();
		}

		Console.WriteLine($"Price: {aviaTickets[selectedIndexY, selectedIndexX].Price}");

		Console.ResetColor();

		ConsoleKeyInfo keyInfo = Console.ReadKey();
		switch (keyInfo.Key)
		{
			case ConsoleKey.UpArrow:
				{
					if (selectedIndexY > 0)
					{
						selectedIndexY--;
					}
				}
				break;
			case ConsoleKey.DownArrow:
				{
					if (selectedIndexY < aviaTickets.GetLength(0) - 1)
					{
						selectedIndexY++;
					}
				}
				break;

			case ConsoleKey.LeftArrow:
				{
					if (selectedIndexX > 0)
					{
						selectedIndexX--;
					}
				}
				break;
			case ConsoleKey.RightArrow:
				{
					if (selectedIndexX < aviaTickets.GetLength(1) - 1)
					{
						selectedIndexX++;
					}
				}
				break;
			case ConsoleKey.E:
				aviaTickets[selectedIndexY, selectedIndexX].IsSelected = !aviaTickets[selectedIndexY, selectedIndexX].IsSelected;
				break;
			case ConsoleKey.Enter:
				while (true)
				{
					if (aviaTickets[selectedIndexY, selectedIndexX].IsBooked)
					{
						Console.WriteLine("Занято");
						Console.WriteLine("Нажмите любую клавишу для продолжения");
						Console.ReadKey();
						break;
					}

					Console.WriteLine("Для подтверждения нажмите ENTER клавишу");

					if (Console.ReadKey().Key == ConsoleKey.Enter)
					{
						aviaTickets[selectedIndexY, selectedIndexX].IsSelected = true;

						foreach (var ticket in aviaTickets)
						{
							if (ticket.IsSelected)
							{
								ticket.IsBooked = true;
							}
						}

						break;
					}
				}

				break;
		}
		Console.ResetColor();
	}
}

class Seat
{
	public string Name;
	public bool IsBooked;
	public bool IsSelected;
	public int Price;

	public Seat(string name, int price)
	{
		Name = name;
		Price = price;
	}
}