Oriental Magpie-Robin

thanxx a lot again..now my confusion is over..!

Welcome Shashank! Firstly I have corrected the Common Name and added the Scientific name to this spotting for you.
As per your query regarding the three birds. They are completely different birds Please see the pictures:
White Wagtail: http://orientalbirdimages.org/search.php...
Oriental Magpie Robin: http://orientalbirdimages.org/search.php...
Pied Bushchat: http://orientalbirdimages.org/search.php...
The white bar on the wing is a good identification mark for Oriental Magpie Robin as in your case.

thank you satendra actually i m quite confused on these three birds namely white wagtail, magpie robin and pied bushchat male..all have balck body and white strip...can u help me how to identify them seaparately ! thank you