private void button3_Click(object sender, EventArgs e) { Phan5.HinhHoc.Bai3 fr = new Phan5.HinhHoc.Bai3(); fr.ShowDialog(this); }
private void button4_Click(object sender, EventArgs e) { Phan5.HinhHoc.Bai3 fr = new Phan5.HinhHoc.Bai3(); fr.Show(); }