//Danh mục private void sáchToolStripMenuItem_Click(object sender, EventArgs e) { FrmDanhMucSach dms = new FrmDanhMucSach(); this.Visible = false; dms.ShowDialog(); this.Visible = true; }
//XỬ LÝ 4 BUTTONS private void btn_Sach_Click(object sender, EventArgs e) { FrmDanhMucSach dms = new FrmDanhMucSach(); this.Visible = false; dms.ShowDialog(); this.Visible = true; }