WPF EntityFramework DataGrid ComboBox

There may be several ways of doing this:

    <UserControl.Resources>
        <CollectionViewSource x:Key="originatorViewSource" d:DesignSource="{d:DesignInstance my:Originator, CreateList=True}" />
        <CollectionViewSource x:Key="customerLookup" />
    </UserControl.Resources>
                    <DataGridComboBoxColumn x:Name="cboCustomer"
                                            Width="200"
                                            Header="Customer"
                                            ItemsSource="{Binding Source={StaticResource customerLookup}}"
                                            SelectedValueBinding="{Binding Path=CustomerID}"
                                            SelectedValuePath="ID"
                                            DisplayMemberPath="Customer1">
                    </DataGridComboBoxColumn>

        private void LoadComboBox()
        {
            try
            {
                SalesContext contextCustomer = new SalesContext();
                var customerList = from c in contextCustomer.Customers
                                   orderby c.Customer1
                                   select new { ID = c.ID, Customer1 = c.Customer1 };

                CollectionViewSource CustomerViewSource = (CollectionViewSource)this.Resources["customerLookup"];
                CustomerViewSource.Source = customerList.ToList();
                //cboCustomer.ItemsSource = customerList.ToList();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

End