.Net Winform Msg Loop

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.NET

WinForms

Hello,I have a problem about msg loop in .net winform. as we know,each ui thread at least needs one msg loop.but i have tested the code below,i thought the form "frm" would spash and disappear,but it worked well except the client area,i can use mouse to move the form,to close the form etc. now ,i have a question,since everything we do is exchanged to Msg and passed to the thread msg queue,but we need a msg loop ,the codes below don't have one,how do it work?

static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Form1 frm = new Form1();
        frm.Show();
        while(true)
        {

        }
    }
}

tell me why? my pool english,sorry for you.thanks!