private void butClinicPick_Click(object sender, EventArgs e) { List <Clinic> listClinics = gridMain.GetTags <Clinic>(); FormClinics formC = new FormClinics(); formC.ListClinics = listClinics; formC.IsSelectionMode = true; if (formC.ShowDialog() != DialogResult.OK) { return; } _clinicNumTo = formC.SelectedClinicNum; textMoveTo.Text = (listClinics.FirstOrDefault(x => x.ClinicNum == _clinicNumTo)?.Abbr ?? ""); }