using System;
using System.Windows.Forms;

namespace FormShowInTaskbarTest
{
    internal static class Program
    {
        private static Form form1;
        private static Form form2;

        [STAThread]
        static void Main()
        {
            ApplicationConfiguration.Initialize();

            form1 = new Form()
            {
                Width = 800,
                Height = 600,
                StartPosition = FormStartPosition.CenterScreen,
            };

            var button1 = new Button()
            {
                Text = "Click here to open new Form.",

                Width = 200,
                Height = 100,
            };

            button1.Click += Button1_Click;
            form1.Controls.Add(button1);

            Application.Run(form1);
        }

        private static void Button1_Click(object sender, EventArgs e)
        {
            form2 = new Form()
            {
                Width = 600,
                Height = 400,

                StartPosition = FormStartPosition.CenterScreen,
            };

            var button2 = new Button()
            {
                Text = "Click here to test ShowInTaskbar.",

                Width = 200,
                Height = 100,
            };

            button2.Click += Button2_Click;
            form2.Controls.Add(button2);

            form2.ShowDialog(form1);
        }

        private static void Button2_Click(object sender, EventArgs e)
        {
            form2.ShowInTaskbar = false;
        }
    }
}