please find this sample..
February 29, 2008
TO WHOM IT MAY CONCERN
Subject: Letter of Resignation.
I, Mr. Name, would like to tender my resignation from my position in (company) on February 29, 2008.
I am making this decision due to certain unavoidable circumstances that have come my way.
I am truly indebted for the trust, confidence and unwavering support extended by (Company) Management & team in broadening my outlook, capacity and potential during my tenure.
I really cherished every moment of my work at (company). Please be rest assured that I will do all I can to assist in the smooth transfer of my responsibilities before leaving.
I would like to be relieved from my duties by the closing hours of February 29, 2008.
I wish you and (Company) every good fortune and I would like to thank you again for having me in your team.
9th November 2009 From India, New Delhi