According to library settings document shuld open for edit in document library

Hi

i need a functionality same like want to implement  using sharepoint object model in vis 2010

when user select an item in document library and go to  Library tools>documents>edit document

and after whater ever according to  library settings document shuld open for edit

(example microsfot word or browser)

I need functionality same like in my c# code

i have  spfile object  now , using this how accomplish my requirement

SPFilespfile = library.RootFolder.Files.Add(fileName, fileStream, true);

adil