How can I turn CODE properties and Parrams, on and off..

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Sorry about the title, I am not exactly sure what I am looking for here.. So I have this code to disable the close button on a form (Red X):

VB

Protected Overrides ReadOnly Property CreateParams() As CreateParams
    Get
        Dim cp As CreateParams = MyBase.CreateParams
        Const CS_NOCLOSE As Integer = &H200
        cp.ClassStyle = cp.ClassStyle Or CS_NOCLOSE
        Return cp
    End Get
End Property

Now that disables the close button as soon as the form shows, but how can I have it not disable the close button until a user presses a button for example?
Thanks.

Posted 16-Aug-11 8:25am

NY Andrew

Updated 16-Aug-11 8:28am

#realJSOP

v2

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Alan N · Accepted Answer · 2011-08-16T12:23:00

The class style can be modified after window creation via the Windows API functions Get/SetClassLong (or Get/SetClassLongPtr for 64 bit compatibility).

VB

Private Const GCL_STYLE As Integer = -26
Private Const CS_NOCLOSE As Integer = &H200
<DllImport("user32.dll", EntryPoint := "GetClassLong")> _
Private Shared Function GetClassLong(hWnd As IntPtr, nIndex As Integer) As UInteger
<DllImport("user32.dll", EntryPoint := "SetClassLong")> _
Private Shared Function SetClassLong(hWnd As IntPtr, nIndex As Integer, dwNewLong As UInteger) As UInteger

Private Sub ToggleStyleBtn_Click(sender As Object, e As EventArgs)
    Dim currentStyle As UInteger = GetClassLong(Me.Handle, GCL_STYLE)
    REM flip the CS_NOCLOSE bit
    SetClassLong(Me.Handle, GCL_STYLE, currentStyle Xor CS_NOCLOSE)
    REM force a redraw with the new style
    UpdateStyles()
End Sub

Alan.