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Hi Manish,
Please refer the below links
http://strictlysql.blogspot.in/2010/11/lock-escalation-sql-server-2008.html
http://msdn.microsoft.com/en-us/library/ms184286%28v=sql.105%29.aspx
http://aboutsqlserver.com/2012/01/11/locking-in-microsoft-sql-server-part-12-lock-escalation/
Thanks