private void nhàCungCấpToolStripMenuItem_Click(object sender, EventArgs e)
{
if (ncc == null)
{
ncc = new NhaCungCapForm();
ncc.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.DanhMucHangForm_FormClosed);
ncc.MdiParent = this;
ncc.Show();
}
}
private void NhaCungCapForm_FormClosed(object sender, FormClosedEventArgs e)
{
ncc = null;
}