private void btnPhieuChi_ItemClick(object sender, ItemClickEventArgs e) { frm_LapPhieuChi frm = new frm_LapPhieuChi(); frm.MdiParent = this; frm.Show(); }
private void btnPhieuChi_ItemClick(object sender, ItemClickEventArgs e) { frm_LapPhieuChi frm = new frm_LapPhieuChi(); if (ExistForm(frm)) { return; } frm.MdiParent = this; frm.Show(); }