Question

Here are all my classes.

MainForm = listview,

CustomerFrame = textboxes

When I compile my program, my MainForm appears with an empty listview, and when I press on the add button to insert an item, my CustomerFrame class appears. When writing in the textboxes and clicking ok, no item inserted in my listview (MainForm). Why?

Some code:

MainForm

using(var customerframe = new CustomerFrame())
{   
    if (customerframe.DialogResult == DialogResult.OK) 
    {
        CustomerFiles.Contact contact = customerframe.GetContact();
        CustomerFiles.Address address = customerframe.GetAddress();
        CustomerFiles.Phone phone = customerframe.GetPhone();
        CustomerFiles.Email email = customerframe.GetEmail();

        //Items in my listview
        listviewitem = new ListViewItem();
        listviewitem.SubItems.Add(contact.FirstName);
        listviewitem.SubItems.Add(contact.LastName);
        listviewitem.SubItems.Add(phone.Home);
        listviewitem.SubItems.Add(phone.Mobile);
        listviewitem.SubItems.Add(address.Country);
        listviewitem.SubItems.Add(address.ZipCode);
        listviewitem.SubItems.Add(address.City);
        listviewitem.SubItems.Add(address.Street);
        listviewitem.SubItems.Add(email.Personal);

        this.listView1.Items.Add(listviewitem);

    }
}

MainForm

private void addToolStripMenuItem_Click_1(object sender, EventArgs e)
{
    customerframe.Show();
    CustomerManager cm = new CustomerManager();
}

CustomerFrame

private void btnOk_Click(object sender, EventArgs e)
{
    MainForm main = new MainForm();
    DialogResult = DialogResult.OK;        
}

By the way, when I use

 if (customerframe.ShowDialog() == DialogResult.OK)

this will make the CustomerFrame form appear before the MainForm (which I don’t want) and it will insert item, but only once.

Answer 1

Why do you open ANOTHER main form from DialogBox? I think that you should remove this line.

MainForm main = new MainForm();

And add this

DialogResult = DialogResult.OK;
Close();

Argh, to simplify – code in ButtonOK should look like this:

private void btnOk_Click(object sender, EventArgs e)
{
   DialogResult = DialogResult.OK;
   Close();    
}

EDIT: response to new problem

First create new CustomerFrame, show it and wait for it to close; then transfer new data to your ListView. I believe that your add handler should look like this:

private void addToolStripMenuItem_Click_1(object sender, EventArgs e)
{
    using(var customerframe = new CustomerFrame())
    {   
        // I don't know what this line does
        CustomerManager cm = new CustomerManager();

        if (customerFrame.ShowDialog() == DialogResult.OK) 
        {
            CustomerFiles.Contact contact = customerframe.GetContact();
            CustomerFiles.Address address = customerframe.GetAddress();
            CustomerFiles.Phone phone = customerframe.GetPhone();
            CustomerFiles.Email email = customerframe.GetEmail();

            //Items in my listview
            listviewitem = new ListViewItem();
            listviewitem.SubItems.Add(contact.FirstName);
            listviewitem.SubItems.Add(contact.LastName);
            listviewitem.SubItems.Add(phone.Home);
            listviewitem.SubItems.Add(phone.Mobile);
            listviewitem.SubItems.Add(address.Country);
            listviewitem.SubItems.Add(address.ZipCode);
            listviewitem.SubItems.Add(address.City);
            listviewitem.SubItems.Add(address.Street);
            listviewitem.SubItems.Add(email.Personal);

            this.listView1.Items.Add(listviewitem);
        }
    }
}