private void toolStripButton4_Click(object sender, EventArgs e)
{
frmSach ds = new frmSach();
ds.MdiParent = this;
ds.Show();
}
private void btn_Sach_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
frmSach f = new frmSach();
if (ExistForm(f))
{
return;
}
f.MdiParent = this;
f.Show();
}
private void danhMụcSáchToolStripMenuItem_Click(object sender, EventArgs e)
{
//using (frmSach f = new frmSach())
//{
// f.ShowDialog();
//}
frmSach ds = new frmSach();
ds.MdiParent = this;
ds.Show();
}