Action when form is closed

Question

How to make as by pressing to the close button, make so that the form was not closed, and it was turned off?

private void Form1_Closed(object sender, EventArgs e)
{
    Form1.Hide();
}

So the form is all the same closed.

Answer 1

You should do it on FormClosing not FormClosed event like this:

private void Form1_FormClosing(object sender, EventArgs e) {
    Form1.Hide();
    e.Cancel = true;
}

FormClosed means the form is already closed.

Answer 2

You want to interrupt the form closing event and cancel it, for example to minimize:

private void Form_FormClosing(object sender, FormClosingEventArgs e)
{
   e.Cancel = true;
   this.WindowState = FormWindowState.Minimized;
}