C#

<br />
foreach(Train train in this.trains)<br />
foreach(Car car in train.Cars)<br />
car.CarsChanged+=new CarsChangedEventHandler(Cars_Changed);<br />

<br />
Car car=new Car();<br />
car.CarsChanged+=new CarsChangedEventHandler(Cars_Changed);<br />
this.SelectedTrain.AddCar(car);<br />

<br />
//Somewhere in your domain<br />
public Car AddNewCarToTrain(Train train)<br />
{<br />
Car car=new Car();<br />
//other initilizaing and validating code<br />
train.Cars.Add(car);<br />
return car;<br />
}<br />
//Then you can add your handler in your UI<br />
AddNewCarToTrain(this.selectedTrain).CarsChanged+=new CarsChangedEventHandler(Cars_Changed);<br />

<br />
private void Cars_Changed(object sender,EventArgs e)<br />
{<br />
 int index = ((Cars)object).index;<br />
}<br />

<br />
private void Start()<br />
{<br />
 Cars []myCars = new Cars[10];<br />
 for (int i = 0 ; i < myCars.Length ; i++)<br />
 {<br />
   //some other code<br />
   myCars[i].Index = i;<br />
   myCars[i].Click += new EventHandler(Cars_Click);<br />
 }<br />
}<br />
<br />
private void Cars_Click(object sender,EventArgs e)<br />
{<br />
 int index = ((Cars)sender).Index;<br />
}<br />

<br />
XmlDocument doc = new XmlDocument();<br />
doc.Load("file.xml");<br />
XmlNodeList list = doc.DocumentElement.ChildNodes;<br />
foreach(XmlNode node in list)<br />
{<br />
 string name = node.Name;<br />
 string value = node.InnerText;<br />
 bool hasChildNodes = node.HasChildNodes;<br />
}<br />