Disabling the exit button on a windows form?

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

To disable the close button on the form just write the below code on the form closing event.

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        e.Cancel = true;
    }