Nishitendu Chaudhury, J.

1. Judgment and order dated 14.12.2012 passed by the Hon'ble Single Judge in W.P.(C) 3464/2011 allowing the writ petition and setting aside the selection and appointment of respondent No. 4 to the post of Administrative Officer in the establishment of Deputy Commissioner of Dima Hasao district has been challenged in the present writ appeal. The writ petitioner is a Senior Administrative Assistant in the Office of the Deputy Commissioner, Dima Hasao district. The case of the writ petitioner is that on 6/13th July, 2009, the Deputy Commissioner of Dima Hasao district issued an advertisement inviting applications in standard form from eligible candidates to fill up the vacant post of Administrative Officer in his office stating that applicants must have rendered at least 15 years of service in any D.C's establishment having work experience in different branches in general and must be a graduate from any recognized university. The advertisement contained a stipulation that applications should reach the Office of the Deputy Commissioner on or before 05.06.2009 together with a copy of treasury challan for Rs. 5/- for candidates under general category and R