Question

What is best practice when closing a C# application?

I have read that you can use:

Environment.Exit(0); or Application.Exit();

But what is the difference?

Furthermore, with regards to Environment.Exit(0), I have used exit codes before when working with Java but have never fully understood their purpose. What role do they play when exiting an application in C#?

Answer 1

System.Windows.Forms.Application.Exit() – Informs all message pumps that they must terminate, and then closes all application windows after the messages have been processed. This method stops all running message loops on all threads and closes all windows of the application. This method does not force the application to exit. The Exit() method is typically called from within a message loop, and forces Run() to return. To exit a message loop for the current thread only, call ExitThread(). This is the call to use if you are running a Windows Forms application. As a general guideline, use this call if you have called System.Windows.Forms.Application.Run().

System.Environment.Exit(exitCode) – Terminates this process and gives the underlying operating system the specified exit code. This call requires that you have SecurityPermissionFlag.UnmanagedCode permissions. If you do not, a SecurityException error occurs. This is the call to use if you are running a console application.

I hope it is best to use Application.Exit

See also these links:

• Application.Exit() vs Application.ExitThread() vs Environment.Exit()
• http://geekswithblogs.net/mtreadwell/archive/2004/06/06/6123.aspx