C#实现登录窗口(不用隐藏)

static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

Form form = new login();
form.Show();

Application.Run();
}

private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text == "497122758" && textBox2.Text == "123456")
{
this.Close();
new QQMain().ShowDialog();

}
}

private void pictureBox1_Click_1(object sender, EventArgs e)
{
this.Close();
Application.Exit();
}