I would like to tecord my sincere thanks to our chairman "Kalvivallal" Thiru T. Kalasalingam B.com, and our secretary " LLayavallal "Thiru K.Sridharan M.B.A.who gave me inspiration for my social service. I gratefully acknowledge the encouragement given by our principal Dr.S.Selvamani M.sc ph.D. Arulmigu kalasalingam collage of arts & science, for the successful completion of this book. I place on record my dept to Mrs.S.Vetha M.C.A,M.phil. Head of the department of computer applications and mrs.D.Amuthaguka. M.Sc, M.Phil. Head of the department of information tachnology , arulmigu kalasalingam collage of arts & science, krishnankoil. I dept to Mr.G. Rajamani, Mr. S.Murugan , Mr.A. Parandaman, Miss.C. Rhini Moniha , and Mr.C .Ponnupandi for assisting me to
accomplish this work quickly and successfully.
I sincerely thank to my friends, collagues and students for their valuable suggestion and correcton through out this work.I leeply indebted to my parents, Brothers, My wife B.Anitha M.Sc, M,Phil, daughter B.Aishwarya and son R.Akilan for their patience & encouragement during the preparation of this book. Istate my hearty gratitude to NEW Century Book house for its immediate acceptance to publish this book amidst its hectic work scgeduled. Healthy criticism and useful suggestion for the improvement of this book is aiways welcome.
-Author.
