ListViewGroup ignoring me!

Hi,

I'm having problems with the ListViewGroup class in the ListView control. There seems to be 10 different ways to achieve the same purpose, that of grouping ListViewItems, but none of them seem to work.

Here is what I have at the moment:

Some background:

I have a simple enough dictionary, whereby the key is a client, which has many contacts.

Code Snippet

Dictionary<IClient, List<IContact>> clientContactDictionary = new Dictionary<IClient, List<IContact>>();

This is populated all fine. eg. I have 17 clients, each with one or more contacts. I want the grouping to be by Client, with ListViewItems representing Contacts.

This is how I am building my listview, known as resultsListView:

Code Snippet

foreach (IClient client in clientContactDictionary.Keys)

{

ListViewGroup lvg=new ListViewGroup(client.ID.ToString(),client.BusinessName);

resultsListView.Groups.Add(lvg);

foreach (IContact contact in clientContactDictionary[client])

{

ListViewItem lvi=new ListViewItem(new string[] { contact.ContactName,contact.EmailAddress },lvg);

lvi.Text = contact.ContactName;

lvi.Tag = contact;

resultsListView.Items.Add(lvi);

resultsListView.Items[resultsListView.Items.Count - 1].Group = lvg;

//Application.DoEvents();

}

But is a URL to all I get is the standard listview output:

http://www.programx.me.uk/for_external/03122008/msdn1.jpg

(Forgive gratuitious anonymisation)

ListViewGroup ignoring me!

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