how is it possible to distinguish between the event, that the user explicitly pressed to x-button (or pressed ALT F4) to close a form and all other methodes of closing the form programatically (me.close(), etc). I already figured out, that this could be done using sender objects but I don't really get it. Could somebody explain it for me with an example? Thank you all very much in advance.
The class FormClosingEventArgs event args has an enumeration to tell what the reason the form is closing.
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs) Handles Me.Closing
If Not appClosing AndAlso e.CloseReason = System.Windows.Forms.CloseReason.UserClosing Then
' DO WHATEVER CODE YOU WANT IN HERE
' LIKE SETTING E.CANCEL TO TRUE
' You can also set a close appClosing local variable at the class level as a boolean, whenever you call closing in code, assign the variable.
appClosing = True