[RESOLVED] How to stop closing form?

[sunhpj]

I need to check whether the user really want to close the form.

But if I do this in Formclosing, the form will be closed anyway.

[Link]

You can use e.Cancel to close or cancel closing the form.

Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        If MsgBox("Are you sure you want to close?", MsgBoxStyle.YesNo, "Close?") = MsgBoxResult.Yes Then
            e.Cancel = False
        Else
            e.Cancel = True
        End If
    End Sub

[alex_read]

This question has already been answered nicely by Link, though this sample code uses the preferred .Net framework System.Windows.Forms namespace version of the message box as opposed to the Microsoft.VisualBasic.Interaction namespace version:

    Private Sub Form1_FormClosing(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        Select Case MessageBox.Show("Are you sure you want to close?", "Confirm form closure", _
                                     MessageBoxButtons.YesNo, MessageBoxIcon.Question)
        Case Windows.Forms.DialogResult.Yes
            e.Cancel = False
        Case Else
            e.Cancel = True
        End Select
    End Sub

[JuggaloBrotha]

To summarize it all on one line:

Private Sub Form1_FormClosing(...) Handles Me.FormClosing
    e.Cancel = MessageBox.Show("Are you sure you want to close?", "Confirm form closure", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = Windows.Forms.DialogResult.Yes
End Sub