WinForm remove the close button in the upper right corner

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One way is to display the form's properties in the form's properties panel ControlBox Property is set to false, Or write this in the constructor of the form ：

1 public Form1()
2         
3 {
4             
5 InitializeComponent();
6             
7 this.ControlBox = false;   //  Set that the close button does not appear  http://www.cnblogs.com/roucheng/
8         
9 }

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But in doing so , Will be removed along with the minimize and maximize buttons , therefore , If you want to just make the close button inoperative , Then keep it minimized 、 Maximize , Just rewrite the form CreateParams Method ：

 1 // Disable the close button of the form 
 2         
 3 private const int CP_NOCLOSE_BUTTON = 0x200;
 4         
 5 protected override CreateParams CreateParams
 6         
 7 {
 8             
 9 get
10             
11 {
12                 
13 CreateParams myCp = base.CreateParams;
14                 
15 myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON;
16                 
17 return myCp;
18             
19 }
20         
21 }

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Or cancel the execution of the close event in the upper left corner

 1 private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
 2 
 3 
 4 {
 5 
 6 
 7 e.Cancel = true;
 8 
 9 
10 }
11 
12 
13 
14 
15 
16 
17 //  rewrite OnClosing Enables the form to indent the tray when the close button is clicked 
18 //http://www.cnblogs.com/roucheng/
19 
20 protected override void OnClosing(CancelEventArgs e)
21 
22 
23 {
24 
25 this.ShowInTaskbar = false;
26 
27 this.WindowState = FormWindowState.Minimized;
28 
29 
30 e.Cancel = true; 
31 
32 
33 }

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