Output to console in Windows Forms application

ShowConsole.cs

namespace ShowConsole
{
    using System;
    using System.Runtime.InteropServices;
    using System.Windows.Forms;

    public static class Program
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool AllocConsole();

        [STAThread]
        public static void Main()
        {
            Program.AllocConsole();

            Console.WriteLine("Hello world");

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}