What is the best way to detect all ways of closing a form?

Question

I have a form that i close using End several times in my code. I want to do a command to save settings when I do this called VarsToIni() which takes some public variables and saves them in an INI file. I have tried putting it in the main window's FormClosing (which stays open throughout) and this only works when you close from pressing the X button not from my End statement.

Answer 1

Add a new Sub and replace calls to End with calls to your new Sub:

Sub EndMe()
    VarsToIni()
    Application.Exit() 
End Sub

Edit:

As Dan points out, End() is a bad way to close the application, Application.Exit() is preferred.

Answer 2

Consider using Application.Exit() instead of End. This allows FormClosing to be called no matter what (and you can handle it based on how it is being closed).

Private Sub frmMain_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
    Select Case e.CloseReason
        Case CloseReason.ApplicationExitCall
            ' This is the result of Application.Exit()
            e.Cancel = False
        Case CloseReason.UserClosing
            ' This is the result of clicking the red X
            Select Case MessageBox.Show("Are you sure you wish to exit?", "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
                Case DialogResult.Yes
                    e.Cancel = False
                Case DialogResult.No
                    e.Cancel = True
            End Select
        Case Else
            e.Cancel = False
    End Select
    If Not e.Cancel Then
        VarsToIni()
    End If
End Sub

Answer 3

I am quite confused by your question, nonetheless:
This will close all your forms

For each x as Form in My.Application.OpenForms  
'You can then put your VarsToIni() here
 x.Close()
Next

Note: Add this to your import

Imports System.Windows.Forms