MiKoda

using System;

public class Program
{
    public static void Main()
    {
        var n = 0;
        while (true)
        {
            Console.Write("Enter even number: ");
            n = int.Parse(Console.ReadLine());
            if (n % 2 == 0)
                break; // even number -> exit from the loop
            Console.WriteLine("The number is not even.");
        }

        Console.WriteLine("Even number entered: {0}", n);

    }
}