Question

Is there a way to disable the exit button on a windows form without having to import the some external .dll’s? I disable the exit button by importing dll’s using the following code but I don’t like it. Is there a simpler (built-in) way?

    public Form1()     {         InitializeComponent();         hMenu = GetSystemMenu(this.Handle, false);     }      private const uint SC_CLOSE = 0xf060;     private const uint MF_GRAYED = 0x01;     private IntPtr hMenu;      [DllImport('user32.dll')]     private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);      [DllImport('user32.dll')]     private static extern int EnableMenuItem(IntPtr hMenu, uint wIDEnableItem, uint wEnable);      // handle the form's Paint and Resize events       private void Form1_Paint(object sender, PaintEventArgs e)     {         EnableMenuItem(hMenu, SC_CLOSE, MF_GRAYED);     }      private void Form1_Resize(object sender, EventArgs e)     {         EnableMenuItem(hMenu, SC_CLOSE, MF_GRAYED);     } 

Answer 1

A little poking around found this handy helper class:

Disable Close Button and Prevent Form Being Moved (C# version)

It actually does more than what you’re looking for, but essentially does it very nearly the same way you do in your sample code. The helper class hooks into the load/resize events for you so you don’t have to remember to do it yourself.