Explain the concept of Bubbling and Tunneling Events?

hi,

with the help of event bubbling, child control is propagating event up its containment hierarchy. mostly it used in data bound control like datalist, gridview, Repeater....
here event is automatically bubbled up to its parent.

Please refer link for creating bulling event
http://msdn.microsoft.com/en-us/library/aa719644(v=vs.71).aspx

In Tunneling Event, routed event is travels prom parent control to last child controls.

Please refer
http://www.codeproject.com/Articles/23301/WPF-A-Beginner-s-guide-Part-3-of-n
http://www.codeproject.com/Articles/464926/To-bubble-or-tunnel-basic-WPF-events
http://msdn.microsoft.com/en-us/library/ms742806.aspx

hope this will help.