using  System.Windows.Forms;


namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int x;
            Console.Write("Enter a number: ");
            x = Int32.Parse(Console.ReadLine());
            if (x == 2)
            {
                DialogResult ans;
                do
                {
                    ans = MessageBox.Show("do you want to enter another number ?",
                        "have you entered 2?", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                    if (ans == DialogResult.Yes) Console.Clear();
                    else Console.Write(x);
                }
                while (ans != DialogResult.Yes);