C#

    Thread thread = new Thread(new ThreadStart(StartNewThread));
    thread.Start();
}

void StartNewThread(){
    //Application.Run(new Form2());
    this.Invoke(new MethodInvoker(this.LaunchForm2));
}

void LaunchForm2(){
    Form2 frm = new Form2();
    frm.Show();
}

using System;
using System.Threading;
using System.Windows.Forms;

namespace Forms_Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Load += new EventHandler(Form1_Load);
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            Thread thread = new Thread(new ThreadStart(StartNewThread));
            thread.Start();
        }
        private void StartNewThread()
        {
            Application.Run(new Form2());
        }
    }
}

private void button1_Click(object sender, EventArgs e)
{
    System.Threading.Thread t = new System.Threading.Thread(
        new System.Threading.ThreadStart(delegate
    {
        Form1 frm = new Form1();
        frm.ShowDialog();
    }));
    t.Start();
}

Dave Kreskowiak wrote:

it WILL produce bugs