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private void button1_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2();
f2.Owner = this;
f2.Show();
}
private void timer1_Tick(object sender, EventArgs e)
{
label1.Text = System.DateTime.Now.ToString();
}
private void button1_Click(object sender, EventArgs e)
{
Form1 f1 = (Form1 )this.Owner;
f1.timer1.Start();
}