Passing list of objects to main form - winforms

Question

I have the main form Form1 which opens when I run the app. I pass a list from this form which contains Supplier objects to a secondary Form2, to help me build Product objects using an attribute of objects stored in the Suppliers list in Form1.
In Form2 I have the list of Product objects which I want to pass back to Form1 after i complete it and show it in a ListView. But something is not working..i don't figure out what. Thank you in advance.
Form1:
public partial class Form1 : Form
{
public ArrayList suplist = new ArrayList(); //suppliers list
public List<Product> productlist = new List<Product>(); //products list which will be populated with objects sent from Form2
public Form1()
{
InitializeComponent();
//Read Suppliers from txt
StreamReader sr = new StreamReader("Suppliers.txt");
string linie = null;
while((linie=sr.ReadLine())!=null) {
try
{
int id = Convert.ToInt32(linie.Trim().Split(',')[0]);
string nume = linie.Trim().Split(',')[1];
Supplier sp = new Supplier(id, nume);
suplist.Add(sp);
}
catch(Exception ex) { MessageBox.Show(ex.Message); }
}
listView1.Columns.Add("ID");
listView1.Columns.Add("Nume");
listView1.Columns.Add("Units");
listView1.Columns.Add("Price");
listView1.Columns.Add("SUpplier Id");
}
private void button1_Click(object sender, EventArgs e)
{
Form2 from = new Form2(suplist);
from.ShowDialog();
}
public List<Product> ProductList
{
get { return productlist; }
set { productlist = value; }
}
private void button2_Click(object sender, EventArgs e)
{ //this function is supposed to populate listview with the productlist objects when i click the button;
//not sure if it is wrong writeed, or passing the list of products created in Form2 failed
foreach (Product p in productlist)
{
//listView1.Items.Add(p.Id);
ListViewItem itm = new ListViewItem(p.Id.ToString());
itm.SubItems.Add(p.Nume);
itm.SubItems.Add(p.Units.ToString());
itm.SubItems.Add(p.Price.ToString());
itm.SubItems.Add(p.SupplierId.ToString());
}
}
}
Form2:
public partial class Form2 : Form
{
public List<Product> prodList = new List<Product>(); //list which stores the Products == > the list i want to send back to Form 1
public ArrayList supplierList = new ArrayList(); //list of suppliers received from From 1, used to build Products objects
public Form2(ArrayList suplist)
{
InitializeComponent();
supplierList = suplist;
foreach(Supplier s in supplierList)
{
comboBox1_supID.Items.Add(s.Id);
}
Product p1 = new Product(1, "Cola", 4, 45, 1);
Product p2 = new Product(2, "Fanta", 32, 22, 2);
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1__id.Text == "") errorProvider1.SetError(textBox1__id, "Introduceti id");
else if (textBox2_nume.Text == "") errorProvider1.SetError(textBox2_nume, "Introduceti numele");
else if (textBox3_units.Text == "") errorProvider1.SetError(textBox3_units, "Introduceti units");
else if (textBox4_price.Text == "") errorProvider1.SetError(textBox4_price, "enter price");
else if (comboBox1_supID.Text == "") errorProvider1.SetError(comboBox1_supID, "Select sup id");
else
try
{
int id = Convert.ToInt32(textBox1__id.Text);
string nume = textBox2_nume.Text;
int units = Convert.ToInt32(textBox3_units.Text);
double price = Convert.ToDouble(textBox4_price.Text);
int supid = Convert.ToInt32(comboBox1_supID.Text);
Product pd = new Product(id, nume, units, price, supid);
prodList.Add(pd);
MessageBox.Show("Produs adaugat cu succes");
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
textBox1__id.Clear();
textBox2_nume.Clear();
textBox4_price.Clear();
textBox3_units.Clear();
errorProvider1.Clear();
}
}
private void textBox4_price_KeyPress(object sender, KeyPressEventArgs e)
{
if (!char.IsDigit(e.KeyChar))
{
errorProvider1.SetError(textBox4_price, "Introduceti numai cifre");
}
else errorProvider1.Clear();
}
private void button2_Click(object sender, EventArgs e)
{
Form1 frm = new Form1();
frm.productlist = prodList;
frm.Show();
}
}
I want to send to Form1 prodList from Form2, (store it in productlist i guess in Form1) and show them in listview1 in Form1.
On short, in Form1 I create Suppliers, store them in suplist and pass this list to Form2(in supplierlist). In Form2 I create Products, store them in prodList and pass it to Form1(in productList). Why isn't working? and why listview doesn't show anything??

Answer 1

I haven't worked yet with the ListView-Object itself yet but I think you missed to add the created ListViewItem to your ListView
foreach (Product p in productList)
{
ListViewItem itm = new ListViewItem(p.Id.ToString());
itm.SubItems.Add(p.Nume);
itm.SubItems.Add(p.Units.ToString());
itm.SubItems.Add(p.Price.ToString());
itm.SubItems.Add(p.SupplierId.ToString());
listView1.Items.Add(itm);
}