Gets or sets a reference to the object that raised the event.
Assembly: PresentationCore (in PresentationCore.dll)
For any bubbling routed event that has actually traveled the route beyond the element that raised it, and for any tunneling routed event that has not yet tunneled down to the element that raised it, the value of will be different than the value of the sender parameter of the event arguments class. Which of the two elements involved in the event is of the most importance in any given handler (, the element that raised it, or sender, the element that is currently handling it) is dependent on the application logic that your handler is addressing.
Setting this property is typically only done when overriding or implementing other APIs that adjust event sources, such as when class handling an event. Resetting apparent event sources from instance handlers is not recommended, particularly when the handler does not mark the event as handled.
This example shows how to find the source element in an event handler.
The following example shows a Click event handler that is declared in a code-behind file. When a user clicks the button that the handler is attached to, the handler changes a property value. The handler code uses the property of the routed event data that is reported in the event arguments to change the Width property value on the element.