To disable that little close button in your Windows form, either you can set the ControlBox field in Properties window to False or or add this two line in the contructor:
this.ControlBox = false;
Same goes for Maximize and Minimize boxes. Set it using Properties window or add these lines:
this.MaximizeBox = false; this.MinimizeBox = false;
Simple, huh?
Codelicious 
if you disable the control box you automatically lose the icon, minimize and maximize buttons.
This will only disable the X close button:
public partial class Form1 : Form
{
private const int CS_NOCLOSE = 0x200;
protected override CreateParams CreateParams
{
get
{
CreateParams mdiCp = base.CreateParams;
mdiCp.ClassStyle = mdiCp.ClassStyle | CS_NOCLOSE;
return mdiCp;
}
}
public Form1()
{
InitializeComponent();
}
}
simple but incorrect
check http://www.codeproject.com/KB/cs/DisableClose.aspx
for a working solution
Thank you!!! that small works miracles.. the code for making the close inactive.. thank you
private const int
CP_NOCLOSE_BUTTON = 0x200;
protected override CreateParams CreateParams
{
get
{
CreateParams myCp = base.CreateParams;
myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON ;
return myCp;
}
}
Many Thanks for your answer
Thank you! Excellent snippet!
great.. thank you.
Here you can find a perfect solution for this issue. I had the same problem and I fixed it.
http://www.php24hours.com/c-sharp-how-to-disable-the-close-button-t164.html
its realy good thanks dud……
Ohhh Heartily Thank you Very Much… 🙂
this is realy good thank you so much
thank you very much!!! its really good
Thats right..
this code has very great work
thanks for it.
I am very happy to get this code
Can we disable these buttons during runtime?
i want know only about cancel button only… other (maximize , minimize) should be visible.. while cancel button should be disable..
thanks
SILENCE WHINERS!!!
The controlbox = false/true works fine!!!
thanks man …..thanks
Thank you very much………..
Thank you very much Ji that solve my all problem chak de
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[…] Disable Close button in Windows form | Codelicious – Sep 07, 2007 · To disable that little close button in your Windows form, either you can set the ControlBox field in Properties window to False or or add this two line in … […]