private void thêmNhàXuấtBảnToolStripMenuItem1_Click(object sender, EventArgs e)
{
frmThemNXB a = new frmThemNXB();
a.MdiParent = this;
a.Show();
}
private void thêmNhàXuấtBảnToolStripMenuItem_Click_1(object sender, EventArgs e)
{
Form nxb = new frmThemNXB();
nxb.MdiParent = this;
nxb.Show();
}
private void button3_Click(object sender, EventArgs e)
{
Form a = new frmThemNXB();
a.Show();
}