Variables not accepting values passed from another class
<p>I am about to give up on this, i am trying to pass a string to another class and in that class save it to a List but it just wont do it. I know the List exists and works as i made a button that puts a string into that list and shows it in the listbox. But for some reason i just cant get it to work on the passed string.</p>

<p>It's two winforms as one let's the user give the info and then it's processed and passed to the another class which should then save into the List and then i call for a update which should show the List in the listbox.</p>

<p>Mainform (the one with the listbox)</p>

<pre><code>public partial class MainForm : Form
{        

    List&lt;string&gt; m_customers = new List&lt;string&gt;();    


    public MainForm()
    {
        InitializeComponent();            
    }


    public void StringToList(string strnew)
    {           
        m_customers.Add(strnew);
        Updatelistbox();

        foreach (string custom in m_customers)
        {
            lstRegistry.Items.Add(custom);
        }
    }

    private void strtest(string strnew)
    {
        string userinfo = strnew;
        m_customers.Add(userinfo);
    }

    private void Updatelistbox()
    {
        lstRegistry.Items.Clear();
        for (int index = 0; index &lt; m_customers.Count; index++)
        {
            lstRegistry.Items.Add(m_customers[index]);
        }
    }      

    private void button1_Click(object sender, EventArgs e)
    {
        using (ContactForm frm = new ContactForm())
        {
            frm.ShowDialog();
        }
    }


    private void button2_Click(object sender, EventArgs e)
    {                 
        lstRegistry.Items.Add("Hey this works atleast...");

        m_customers.Add("add this to List");  //This works as this line becomes more and more.
        foreach (string custom in m_customers)
        {
            lstRegistry.Items.Add(custom);
        }        
    }
}
</code></pre>

<p>The inputform</p>

<pre><code>public partial class ContactForm : Form
{
    private ContactFiles.Contact m_contact = new ContactFiles.Contact();
    private ContactFiles.Email m_email = new ContactFiles.Email();
    private ContactFiles.Phone m_phone = new ContactFiles.Phone();
    private ContactFiles.Adress m_adress = new ContactFiles.Adress();

    private bool m_closeForm;

    public ContactForm()
    {

        InitializeComponent();

        InitializeGUI();
    }

    private void InitializeGUI()
    {
        txtFirstName.Text = string.Empty;
        txtLastName.Text = string.Empty;
        txtHomePhone.Text = string.Empty;
        txtCellPhone.Text = string.Empty;
        txtEmailBusiness.Text = string.Empty;
        txtEmailPrivate.Text = string.Empty;
        txtStreet.Text = string.Empty;
        txtCity.Text = string.Empty;
        txtZipCode.Text = string.Empty;
        FillCountryComboBox();
        cmbCountries.Items.AddRange(FillCountryComboBox()); cmbCountries.SelectedIndex = 5;
        m_closeForm = true;
    }


    public string[] FillCountryComboBox()
    {
        string[] m_countryStrings = Enum.GetNames(typeof(Countries));

        for (int index = 0; index &lt; m_countryStrings.Length - 1; index++)
        {
            m_countryStrings[index] = m_countryStrings[index].Replace("_", " ");
        }
        return m_countryStrings;
    }

    private void btnOK_Click(object sender, EventArgs e)
    {           
        string a_country = cmbCountries.SelectedItem.ToString();
        var oAdress = new ContactFiles.Adress(txtStreet.Text, txtCity.Text, txtZipCode.Text, a_country);
        string adresslist = oAdress.ToString();            
        var oEmail = new ContactFiles.Email(txtEmailBusiness.Text, txtEmailPrivate.Text);
        string emaillist = oEmail.ToString();            
        var oPhones = new ContactFiles.Phone(txtHomePhone.Text, txtCellPhone.Text);
        string phonelist = oPhones.ToString();
        //This is actually working, the string is passed OK.            
        //MainForm strin = new MainForm();            
        var oContact = new ContactFiles.Contact(txtFirstName.Text, txtLastName.Text);
        string namelist = oContact.ToString();

        //Create string from input and send to MainForm.StringToList()
        MainForm instance = new MainForm();
        string strnew = string.Format("{0,-3} {1, -10} {2, -20} {3, -30}", namelist, phonelist, emaillist, adresslist);
        instance.StringToList(strnew);


        this.Close();
    }

    private ContactFiles.Contact Contacts
    {
        get { return m_contact; }
        set
        {
            if (value != null)
                m_contact = value;                
        }
    }

    public ContactFiles.Email Email
    {
        get { return m_email; }
        set 
        {
            if (value != null)
            m_email = value; 
        }
    }

    public ContactFiles.Phone Phone
    {
        get { return m_phone; }
        set
        {
            if (value != null)
                m_phone = value;
        }
    }

    private ContactFiles.Adress Adress
    {
        get { return m_adress; }
        set
        {
            if (value != null)
                m_adress = value;
        }
    }

    private void ContactForm_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (m_closeForm)
            e.Cancel = false;  //Close the Contact form.
        else
            e.Cancel = true; //Do not close (user has chosen Cancel)
    }      
}
</code></pre>

<p>There are as you can see some more classes that handles the user input that contains constructors but they all work as i can create the string from all the user input but then i fails big time for me and its like 3 days now and i still can't find the problem.  :'(</p>

<p>Any idea on how to fix my problem?!? I just cant find the issue.</p>
