private void danhSáchLớpToolStripMenuItem_Click(object sender, EventArgs e) { frmLop frmLop = new frmLop(this); this.Hide(); frmLop.Show(); }
private void lopToolStripMenuItem_Click(object sender, EventArgs e) { closeAllForm(); if (fLop.IsDisposed) { fLop = new frmLop(); } fLop.MdiParent = this; fLop.WindowState = FormWindowState.Maximized; fLop.Show(); }