private void quảnLýMặtHàngToolStripMenuItem_Click(object sender, EventArgs e) { Thongke nv = new Thongke(); if (CheckExistForm("Thongke") == true) { nv.Activate(); } else { nv.MdiParent = this; nv.Show(); } }
private void btnIn_Click_1(object sender, EventArgs e) { Thongke incthd = new Thongke(); incthd.Show(); }