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(); }