All I am doing is a simple:

    // Both the methods, order.GetAllOrderItems() and order.GetOrderedItemsWhereBrandIs("foo")
    // return an IEnumerable<T> so the assignment to the DataSource property of the DataGridView
    // should be fine. The problem is in re-assigning the data source property.
    public void DisplayItems()
    {
        // The data appears if I have just this line.
        dgvOrderedItems.DataSource = order.GetAllOrderItems();

        dgvOrderedItems.DataSource = null;

        // This time the data grid does not take the new data source. Instead, because
        // of the null assignment in the previous statement, it displays no data at all.
        dgvOrderedItems.DataSource = order.GetOrderedItemsWhereBrandIs("Lenovo");
    }

My question is: is there a way to change the data source of a DataGridView control once it has been set? I am using C# 4.0 and Visual Studio 2010 for development.