Disabling ALT + F4 in VB.NET application

[RupaliP]

Hello!

I want in my vb.net application that user can not close the application simply by using ALT + F4 from keyboard unless he enters the correct password!

Anyone know how to do this?

[Kiran123]

In the form's 'Closing' event handler, set 'e.Cancel = True' to stop
closing the form.

[Shashikant]

Set the forms KeyPreview property to True at design time or during form load you can do

Me.KeyPreview = True

and use the forms KeyDown event handler to block the Alt-F4 key combo as shown below.

 Private Sub Form1_KeyDown(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown

        If e.Alt = True And e.KeyCode = Keys.F4 Then
            e.Handled = True
        End If

    End Sub

[Matellis]

Option Explicit

Private Sub Command1_Click()
    Unload Me
End Sub

Private Sub Form_QueryUnload(Cancel As Integer, _
    UnloadMode As Integer)
    If UnloadMode = vbFormControlMenu Then
        Cancel = True
    End If
End Sub

Hope this helps!