Cancel form closing by user selection

Question

In a vb.net windows application, I need user to confirm before closing application. I have this code in FormClosing event

If BackgroundWorker1.IsBusy Then
    Dim UserSelection As Integer = MsgBox("Do you want Cancel Processing and Exit Application?", MsgBoxStyle.Exclamation + MsgBoxStyle.YesNo, "Exit Application")
    If UserSelection = 6 Then
        BackgroundWorker1.CancelAsync()
        e.Cancel = True
    Else
        ????
    End If
End If

How can I cancel form closing if user clicked No ?

Tried e.Cancel = false but it didn't work (exits application).

Answer 1

e.Cancel = True将停止关闭表单。

Answer 2

根据文档“ e.Cancel = True”，可以防止表单关闭

Answer 3

This is full code for cancel form closed. We should use FormClosing Event.

Private Sub Frm1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        If MessageBox.Show("Do you want to closed", Me.Text, MessageBoxButtons.OKCancel) = Windows.Forms.DialogResult.Cancel Then
            e.Cancel = True
        End If
    End Sub