private void btnQuanLy_Click(object sender, EventArgs e) { QuanLyTruong Ql = new QuanLyTruong(); this.Visible = false; Ql.ShowDialog(); }
private void btnQuayLai_Click(object sender, EventArgs e) { this.Visible = false; QuanLyTruong qlsv = new QuanLyTruong(); qlsv.Show(); }