Right click on the window in question, then click Properties. Under Properties click Events. Double click on the FormClosing event.
The following code will be generated by Windows Form Designer:
private void myWindow_FormClosing(object sender, FormClosingEventArgs e)
{
}
Simply update the code to look like this (add e.Cancel = true;):
private void myWindow_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = true;
}
You're done!
Alternatively, if you want to disable the close, maximize, and minimize buttons of the window:
You can right click the window in question, then click Properties. Under Properties set the ControlBox property to false.
