Fails to catch duplicate

Fails to catch duplicate

References

Reference NO 1

http://stackoverflow.com/questions/5573722/how-do-you-get-the-duplicate-key-that-todictionary-has-failed-on

Reference NO 2

http://stackoverflow.com/questions/3967226/checking-for-duplicate-keys-with-doctrine-2

Reference NO 3

http://mikefenwick.com/blog/insert-into-database-or-return-id-of-duplicate-row-in-mysql/

Reference NO 4

http://scn.sap.com/thread/1912357

Reference NO 5

http://forums.asp.net/t/prev/1454835

Reference NO 6

https://drupal.org/node/1059214

Reference NO 7

http://www.sqlusa.com/bestpractices2005/duplicateinsert/

Reference NO 8

http://www.symantec.com/connect/forums/be-2012-fails-duplicate-full-backup-tape-more-once