Sample 5. Using transactions and request canceling.

private void button2_Click(object sender, RoutedEventArgs e)
{
	var customer = dataGrid1.SelectedItem as Sample.Northwind.Customer.Get.Entity;
	if (customer != null)
	{
		button2.IsEnabled = false;
		button3.IsEnabled = true;
 
		var orders = dataGrid2.SelectedItems != null && dataGrid2.SelectedItems.Count > 0 ?
			dataGrid2.SelectedItems.Cast<Sample.Northwind.Customer.GetOrders.Entity>().ToList() : null;
 
		var updateCustomer = new Sample.Northwind.Customer.Update();
		updateCustomer.Params.PCustomerId = customer.CustomerID;
		updateCustomer.Params.PAddress = customer.Address;
		updateCustomer.Params.PCity = customer.City;
		updateCustomer.Params.PCompanyName = customer.CompanyName;
		updateCustomer.Params.PContactName = customer.ContactName;
		updateCustomer.Params.PContactTitle = customer.ContactTitle;
		updateCustomer.Params.PCountry = customer.Country;
		updateCustomer.Params.PFax = customer.Fax;
		updateCustomer.Params.PPhone = customer.Phone;
		updateCustomer.Params.PPostalCode = customer.PostalCode;
		updateCustomer.Params.PRegion = customer.Region;
 
		updateCustomer.ExecuteCompleted += (s, args) =>
			OnUpdateRequestExecuted(args, null, orders != null ? () => UpdateOrders(orders) : (Action)null);
 
		_updateRequest = updateCustomer;
		updateCustomer.BeginOpen(false);
	}
}
 
private void OnUpdateRequestExecuted(ExecuteCompletedEventArgs e, Action opened, Action executed)
{
	HandleError(_updateRequest, e);
	if (_updateRequest.IsOpen && _updateRequest.Error == null)
		switch (e.Behavior)
		{
			case RunBehavior.Open:
				if (opened != null)
					opened();
				else
					_updateRequest.BeginExecuteNonQuery();
 
				return;
 
			case RunBehavior.Execute:
				if (executed != null)
					executed();
				else
					_updateRequest.BeginCommit();
 
				return;
		}
 
	CloseUpdateRequest();
}

 
private void UpdateOrders(IEnumerable<Sample.Northwind.Customer.GetOrders.Entity> orders)
{
	var updateOrder = new Sample.Northwind.Order.Update();
	updateOrder.Params.POrderID = orders.Select(o => o.OrderID);
	updateOrder.Params.POrderDate = orders.Select(o => o.OrderDate);
	updateOrder.Params.PRequiredDate = orders.Select(o => o.RequiredDate);
	updateOrder.Params.PShippedDate = orders.Select(o => o.ShippedDate);
 
	updateOrder.ExecuteCompleted += (s, args) => OnUpdateRequestExecuted(args, null, null);
 
	updateOrder.SetConnectionFrom(_updateRequest);
	_updateRequest = updateOrder;
	updateOrder.BeginExecuteBatch();
}

private void button3_Click(object sender, RoutedEventArgs e)
{
	if (_updateRequest != null)
		_updateRequest.Close();
}