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Use "event" keyword with delegate type variable to declare an event. Use built-in delegate EventHandler or EventHandler<TEventArgs> for common events. The publisher class raises an event, and the subscriber class registers for an event and provides the event-handler method.
By default, events raised by child controls in a user control are not available to the host page. However, you can define events for your user control and raise them so that the host page is notified of the event. You do this in the same way that you define events for any class.
Check out Event Bubbling -- http://msdn.microsoft.com/en-us/library/aa719644%28vs.71%29.aspx
Example:
User Control
public event EventHandler StatusUpdated;
private void FunctionThatRaisesEvent()
{
//Null check makes sure the main page is attached to the event
if (this.StatusUpdated != null)
this.StatusUpdated(this, new EventArgs());
}
Main Page/Form
public void MyApp()
{
//USERCONTROL = your control with the StatusUpdated event
this.USERCONTROL.StatusUpdated += new EventHandler(MyEventHandlerFunction_StatusUpdated);
}
public void MyEventHandlerFunction_StatusUpdated(object sender, EventArgs e)
{
//your code here
}
Just add an event in your control:
public event EventHandler SomethingHappened;
and raise it when you want to notify the parent:
if(SomethingHappened != null) SomethingHappened(this, new EventArgs);
If you need custom EventArgs try EventHandler<T> instead with T beeing a type derived from EventArgs.
Or if you are looking for a more decoupled solution you can use a messenger publisher / subscriber model such as MVVM Light Messenger here
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