// In a console application:

Environment.Exit(0);

// In a WPF application:

Close();

System.Environment.Exit(0);

// or

Environment.Exit(0);

if (System.Windows.Forms.Application.MessageLoop) 

{

    // WinForms app

    System.Windows.Forms.Application.Exit();

}

else

{

    // Console app

    System.Environment.Exit(1);

}

​

​

System.Environment.Exit(1);

 Application.Exit();

System.Windows.Forms.Application.ExitThread( )

        private void button1_Click(object sender, EventArgs e) // this is your button double click your button and you will find it

        {

            Application.Exit();

        }

application.exit