تمرین حلقه while .

// تمرین

// by siavash
Console.WriteLine(DateTime.Now);

while (true)
{
    Console.WriteLine("choose one to three");
    string input = Console.ReadLine();
    try
    {
        int number = Convert.ToInt32(input);
        switch (number)
        {
            case 1:
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine("you write number 1");
                break;
            case 2:
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine("you write number 2");
                break;
            case 3:
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine("you write number 3");
                break;
            default:
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("not found");
                continue;
        }
        Console.ResetColor();
        break;
    }
    catch
    {
        Console.WriteLine("please just number");
    }
}