I've got a very simple test:

1    public LeftView()
2    {
3        InitializeComponent();
4    
5        products = new ProductCollection();
6        productBindingSource.DataSource = products;
7    }
8    
9    private void button1_Click(object sender, EventArgs e)
10   {
11       products.AddNew();
12   }

No matter how many times I click that button... I don't see any new entities in the various temp controls I have bound to productBindingSource.  I've tried calling EndEdit() after I call AddNew() but it makes no difference.  I've tried calling refresh on the controls... no difference.

The binding *sorta* works, that is if I call LoadAll() on the collection, I will see the entities that are loaded from the DB, it's the new, in memory ones that aren't showing up. 

I must be missing something very obvious.

Any tips greatly appreciated,
Steve
 

HI David,

Thank you for the response.  Unfortunately this doesn't solve the problem for me.  When I initially load the EntityCollection and bind it to the BindingSource it displays the 2 items I have saved in the DB.  Once I add a new item to the collection and call BindingSource.ResetBindings(false) the ListBox control goes empty.  I set a breakpoint and checked the Count property of the BindingSource.DataSource and it shows the amount I would expect.

Calling BindingSource.AddNew() works, but isn't a good option for me for a couple different reasons.

Can you think of anything else that could cause the kind of behavior I'm seeing?  I' not saving the new entities to the DB, could that matter?  I mean, I will save them if the user clicks save, but as I'm creating them I'm not saving them.

I've narrowed down the problem.  I get the expected bahvior if I create an EntityCollection and bind to a BindingSource.  If I call LoadAll() on the collection before binding, things down work the same.

For example:

1    IFProtocolCollection _protocols = new IFProtocolCollection();
2    
3    public LeftView()
4    {
5        InitializeComponent();
6        //_protocols.LoadAll();
7        bindingSource1.DataSource = _protocols;
8    }

And in by button click handler:

1    private void button1_Click(object sender, EventArgs e)
2    {
3        IFProtocol protocol = _protocols.AddNew();
4        protocol.Name = "ProtTest";
5        bindingSource1.ResetBindings(false);
6    }

If I change the first part and remove the comments on the LoadAll() line, the DataBound ListBox doesn't display anything (even though there are entities in the collection) after I click the "Add Protocol" button.

I hope this is a good clue for you.  I really need to get this stuff sorted out, I've been trying to get a simple ListBox bound to a collection working for almost a week 

Thanks for any suggestions or tips,
Steve

The clue is that it is a ListBox. A ListBox behaves more like a ComboBox than a DataGridView. First, I would not bother with a BindingSource. Second, if you want to change items in the ListBox, I would load it differently.  From MSDN:

"There are two ways to fill the ComboBox and ListBox controls.

For example, you can add objects to the ComboBox by using the Add method. You can also add objects to a ComboBox by using the DataSource, DisplayMember, and ValueMember properties to fill the ComboBox.

When the DataSource property is set, a user cannot modify the items collection."

private ProductCollection products = new ProductCollection();

private void FormCategoryTest_Load(object sender, EventArgs e)
{
	products.LoadAll();
	foreach (Product prod in products)
	{
		listBox2.Items.Add(prod);
	}
	listBox2.DisplayMember =
	  ProductMetadata.PropertyNames.Description;
	listBox2.Sorted = true;
}

private void buttonAdd_Click(object sender, EventArgs e)
{
	Product prod = products.AddNew();
	prod.Description = "My New Product";
	prod.SubCategoryId = 1;
	listBox2.Items.Add(prod);
}