c# – Form Closing Management

I have a small application with multiple forms (Form1..Form5).
Form1 is the main one.
Every time I go from Form1 to another Form I do it with the command (Foe ex. from Form1 to Form2):

private void button1_Click(object sender, EventArgs e)
    {
        Form2 form = new Form2();
        form.Show();
        form.FormClosing += (obj, args) => { this.Close(); };
        this.Hide();
    }

I would like to know how I can return to Form1 when the x in the top right is pressed.
I am trying with the code:

private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
    Form1 form = new Form1();
    form.Show();
}

But don’t work.

can someone help me?