How to disable or remove CLoseBox on the title bar?

Hi there,

I have found a way to achieve it (not best, it works though):

In the class Form:

//**************************************************
//** Win32 method imports to disable CloseBxo on title bar
//**************************************************
[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern int DeleteMenu( IntPtr hMenu, uint uiPosition, uint uiFlags );

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern int DrawMenuBar(IntPtr hWnd)

private const int _iSC_CLOSE = 0XF060;
private const int _iMF_GRAYED = 0x0;

In Form_Load Method:

private void Form_Load(object sender, EventArgs e)
{
   // Disable the CloseBox on the title bar
   DeleteMenu(GetSystemMenu(this.Handle, false), _iSC_CLOSE,_iMF_GRAYED);
   DrawMenuBar(this.Handle);
}


The code above makes the Cloase Box on the applicatrion title bar disabled. That’s all.

One thing is strange to me that I tried using Win32 EnableMenuItem function and it doesn’t work for my purpose.

Thank you,

XWL

Did you not try my code?  It's much smaller...

Thank you Idle_Mind! Your solution is better than what I've found!