Please assist with Unable to Import Offline Outlook Addresses to WF

Question

I am trying to import the list of email addresses from Offline address list to a combo box, it seems to work fine in finding the List however, everytime I try to pull the data, it freezes the whole app, and when putting it into the Form_Load, the app refuses to come up.

I tried to Change to a textbox and issue remained the same. When trying a false address list, the app throughs an error that it can not find the list

    private void button1_Click(object sender, EventArgs e)
    {
        Microsoft.Office.Interop.Outlook.Application app = new Microsoft.Office.Interop.Outlook.Application();
        Microsoft.Office.Interop.Outlook.Accounts accounts = app.Session.Accounts;
        Microsoft.Office.Interop.Outlook.NameSpace oNS = app.GetNamespace("mapi");
        Microsoft.Office.Interop.Outlook.AddressLists oDLs = oNS.AddressLists;
        Microsoft.Office.Interop.Outlook.AddressList oGAL = oDLs["Offline Global Address List"];
        foreach (AddressEntry item in oGAL.AddressEntries)
        {
            comboBox1.Items.Add(item.Address);
        }
    }

Answer 1

To summarize the discussion in the comments:

1. Never loop through all items in an address book container (or a folder for that matter).

2. If you need to resolve a name, use Namespace.CreateRecipient / Recipient.Resolve.

3. Once the recipient is resolved, do not use ToString() method - it is implemented by the .Net wrapper, not by the object itself. Use the property that will return what you need - Recipient.Name. Or Recipient.AddressEntry.GetExchangeUser().PrimarySmtpAddress, etc.