FormClosing event doesn't work as I want

Alternatively look at the ApplicationExit[^] event

I'm thinking you need to look at the Project Properties. On the Application tab (for most versions of Visual Studio) you should see some options like Assembly Name, Root namespace, Application Type, Icon, etc. There is also a property for Shutdown mode. If it's set to "When Startup form closes" then any time you close the Startup form (which is also a property set on this page) the entire application will end. You may want to change that to "When last form closes." This way as long as you have a form open (could still be hidden, though) and haven't called Application.Exit(), your app will continue to run.

You also asked about telling the difference between closing a form with a button or using the x. I typically do that by having a class level boolean. It's set to False in the Load event. If I have a button that closes the form I make sure to set the variable to True before closing...like this:

Private Sub btnHome_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnHome.Click
    boolCloseByButton = True
    Home.Show()
    Me.Close()
End Sub

Then in my Form Closing I check that variable. If it's set to True I know it's closing because of a button I coded. If it's set to false I know that the user must have hit the X to close the form. If I don't really want the form to close I can use the e.Cancel inside the FormClosing event. For example, here is some code that I use to prompt users, only when they close by using the X, to make sure they want to close the form:

Private Sub Form1(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
    If Not boolCloseByButton Then
        If MessageBox.Show("Do you want to exit?", gblstrFormText, MessageBoxButtons.YesNo) = Windows.Forms.DialogResult.No Then
            e.Cancel = True
        End If
    End If
End Sub

If the user selects no, the e.Cancel = True will stop the form from closing.

Hope this helps.

First of all, you really need to review your UI design.

As to your problem, it's way too simple. Just make the log-out code conditional. The fact that you close the form to show "welcome" in the code of the same form (you write me.close, not MyAuthenticationForm.Close only simplifies it: the flag for condition can be private; you would just check-up this flag:

me.performLogoff = false; ' some private Boolean flag
me.close
me.performLogoff = true;

And this me.performLogoff should be checked by the code performing log-off.

One problem is solved, but it would create another problem. If a form is closed, you won't be able to use it again. Any attempt to show it again will throw the exception which tells you the form is disposed.

So, the real solution will be: any form to be shown again should not be closed; hide it instead.

SA

Thank you all for your inputs. Based on the suggestion by

Quote:

Kschuler

, this is how I did it so far:

Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing

      If Not boolCloseByButton Then
          Dim result1 As DialogResult = MessageBox.Show("Do you want to close?", _
                                "On FormClosing event", _
                                MessageBoxButtons.YesNo)

          If result1 = Windows.Forms.DialogResult.No Then
              e.Cancel = True
              MsgBox("Form is NOT closing or exiting application")
          Else
              MsgBox("Logging Off Now")
              'LogOff() will be executed here
          End If
      End If

  End Sub

Quote:

boolCloseByButton

is declared as Boolean and set to "False" during the form's Load event.

So far its working fine for me, I'll continue to experiment with it as I add more forms. May be this solution will help someone else in the future.

Thank you very much everyone.