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private void button2_Click(object sender, EventArgs e)
{
Form frm2 = new Form();
frm2.FormClosed += new FormClosedEventHandler(frm2_FormClosed);
frm2.Show();
}
void frm2_FormClosed(object sender, FormClosedEventArgs e)
{
this.button1_Click(this.button1, EventArgs.Empty);
}