private void btnNXB_Click(object sender, EventArgs e)
{
if (NXB == null || NXB.IsDisposed)
{
NXB = new frmNhaXuatBan();
NXB.MdiParent = this;
NXB.Show();
}
else
{
NXB.Activate();
}
}
private void btnNhaXuatBan_Click(object sender, EventArgs e)
{
frmNhaXuatBan NXB = new frmNhaXuatBan();
NXB.Show();
}