How to cleanly exit a program?

Posted on 2010-09-11
Last Modified: 2013-12-17
I have a C# program running under .NET 2.0, that does some checking for files, etc.  If the files are missing, I want to halt the program.  Right now I'm throwing an exception, which I would like to avoid if possible (that was the only way I could kill the program).  

I have tried Application.Exit(), but the program just continues on as if the statement wasn't executed, which I know it was.

Any ideas?
Question by:rmmarsh
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 33653491
Show us some code...especially the main loop of your app!

What event/method is the code running from?

Is it using a thread?

Details, details, details!...  =)

Author Comment

ID: 33653585
Oops... sorry...

//  check for internet connection  
            ss.Text = "checking internet connection";
            fTrace("I - checking internet connection");
            if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
                fTrace("E - no internet connection");
                DialogResult dlgResult = DialogResult.None;
                dlgResult = MessageBox.Show("No internet connection; do you wish to work offline?", "Prager, Software", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                if (dlgResult == DialogResult.Yes)
                    workOfflineToolStripMenuItem.Checked = true;
                    throw new System.ArgumentException("no internet connection");

            FileInfo fi;
            if (dbPath.IndexOf(':') == dbPath.LastIndexOf(':'))
                fi = new FileInfo(dbPath);
                int i = dbPath.IndexOf(':');
                string filePath = @"\\" + dbPath.Substring(0, i) + @"\";
                //filePath += dbPath.Substring(i + 1, dbPath.Length - i - 1);
                filePath += dbPath.Substring(i + 3, dbPath.Length - i - 3);
                fi = new FileInfo(filePath);

            if (!fi.Exists)  //  if the database is missing, stop...
                fTrace("E - database is missing");
                MessageBox.Show("The database is missing and the program can not continue. \nNotify for help", "Prager, Software", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                throw new System.ArgumentException("database is missing");

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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 33653601
...okay...and WHERE is that code running from?  It looks like a WinForms app...what event is that in?  WHO is catching the exception and what are you doing with it?

Author Comment

ID: 33653631
OK... the code is in the mainForm.cs file... it's the first bit of code that get's executed before the user is presented with the main window.  There are two event handlers to catch the thrown exception (see code below).

Then this code is executed to handle the exception:

        internal static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)

            Exception ex = (Exception)e.ExceptionObject;


// Add the event handler for handling UI thread exceptions to the event.
                Application.ThreadException += new ThreadExceptionEventHandler(mainForm.Form1_UIThreadException);

                // Add the event handler for handling non-UI thread exceptions to the event. 
                AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(mainForm.CurrentDomain_UnhandledException);

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LVL 85

Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 100 total points
ID: 33653710
So in program.cs, you start your app with?

            Application.Run(new mainForm());

and you are executing this code in the Load() or Shown() event of mainForm?

You should just be able to Close() the form instead of throwing an exception...

Change these:

    throw new System.ArgumentException("no internet connection");
    throw new System.ArgumentException("database is missing");


LVL 65

Expert Comment

ID: 33653758
Have you any other forms running? Try closing all your forms including the one running before you issue Application.Exit
LVL 65

Accepted Solution

rockiroads earned 400 total points
ID: 33653771
someone struggling with closing, but has examples of closing

Author Closing Comment

ID: 33653841
Thanks everybody... the following line of code solved my problem...

LVL 85

Expert Comment

by:Mike Tomlinson
ID: 33653858
That's like using a sledge hammer to put in a finishing nail...

There is a proper, less severe way to close your program but we need more information to establish a better understanding of the setup and flow in your app...thus all my questions.

Good luck!...  =)

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