private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) { frmSach fn = new frmSach(); bool Exist = ExistForm(fn); if (Exist) { return; } fn.MdiParent = this; fn.Show(); }
private void btnQuanSach_Click(object sender, EventArgs e) { frmSach f = new frmSach(); f.ShowDialog(); }