关闭当前窗口，打开另一窗口

namespace CloseOpen
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(NewForm));
            thread.Start();
            while (thread.ThreadState != System.Threading.ThreadState.Running) ;
            this.Close();
        }

        private void NewForm()
        {
            Application.Run(new Form2());
        }

    }
}