private void thuêĐĩaToolStripMenuItem_Click(object sender, EventArgs e) { ThueDia frmThueDia = new ThueDia(); foreach (Form frm in MdiChildren) { frm.Close(); } frmThueDia.MdiParent = this; frmThueDia.Show(); }
private void thuêĐĩaToolStripMenuItem_Click(object sender, EventArgs e) { ThueDia frmThueDia = new ThueDia(); hienForm(frmThueDia); }