private void M_btn_bien_dong_nhan_su_ItemClick(object sender, ItemClickEventArgs e) { try { f454_bien_dong_nhan_su v_f = new f454_bien_dong_nhan_su(); if (IsExistFormName(v_f)) return; v_f.MdiParent = this; v_f.Show(); } catch (Exception v_e) { CSystemLog_301.ExceptionHandle(v_e); } }