How to Complete remove the Exit button from the title bar in windows form in C#

Setting FormBorderStyle = "none" will remove the title bar (at both design and run time) - and also remove your ability to resize the form.

If you need a border you can set:

ControlBox = "false";
Text = "";

And if you want to disable the close button then try this:
Disable An Applications Close Button[^]


     --Amit

http://msdn.microsoft.com/en-us/library/system.windows.forms.form.controlbox.aspx[^]

public void CreateMyBorderlessWindow()
 {
    this.FormBorderStyle = FormBorderStyle.None;
    this.MaximizeBox = false;
    this.MinimizeBox = false;
    this.StartPosition = FormStartPosition.CenterScreen;
    // Remove the control box so the form will only display client area.
    this.ControlBox = false;
 }

There is no such button on a title bar. There is nothing to remove.

—SA