Disable the "Close" button of a form

Question

Does anyone know how I disable the "Close" ("X") button of a form in VB.net?

Answer 1

Put this into the codebehind of your form,

Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
    Dim param As CreateParams = MyBase.CreateParams
    param.ClassStyle = param.ClassStyle Or &H200
    Return param
End Get
End Property

Source: here