Visually remove/disable close button from title bar .NET

Question

I have been asked to remove or disable the close button from our VB .NET 2005 MDI application. There are no native properties on a form that allow you to grey out the close

Answer 1

You can disable the close button and the close menu item in the system menu by changing the "class style" of the window. Add the following code to your form:

const int CS_NOCLOSE = 0x200;

protected override CreateParams CreateParams {
    get {
        CreateParams cp = base.CreateParams;
        cp.ClassStyle |= CS_NOCLOSE;
        return cp;
    }
}

This will not just stop the window from getting closed, but it will actually grey out the button. It is C# but I think it should be easy to translate it to VB.