private void btnStatus_Click(object sender, EventArgs e) { try { if (msh.GetCampingInfo(Convert.ToInt32(cbProductsSold.SelectedItem)).Count > 0) { foreach (string item in msh.GetCampingInfo(Convert.ToInt32(cbProductsSold.SelectedItem.ToString()))) { listBox3.Items.Add(item); } } else { MessageBox.Show("This Camping Spot is Free"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } }