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private void button1_Click(object sender, EventArgs e)
{
this.Hide();
Form2 f2 = new Form2();
f2.Show();
}
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
Application.OpenForms["Form1"].Show();
}
Form2 frm2 = new Form2();
frm2.Show(this);
this.Visible = false;
this.Owner.Visible = true;