back up sqlserver 2005 database using Windows Application in C#

sir i creating windows application for enquiry management system......sir i m using sql server 2005

for storing data ...sir want to create backup for all of my stored data..and also want to restore data.......sir plz help me for giving me a tutorial and other info about this ...sir it is very urgent to me...how i can use my databse file into our windows application......thank you