[twitter-dev] tweet id

[Johnfromchennai]

How to get the tweet id for retweeting. i tryed with following code

  Twitter twitter = new Twitter("username", "password", "https://
twitter.com/");
            TwitterStatus tw= twitter.Status.Update("testtttting");
    long id=tw.ID;

when i try to use the id i am getting exception ,B'coz the below url
is not working (404 error)

i am not getting the proper id, but i could able get the tw.Text as
testtttting.
http://api.twitter.com/1/statuses/retweet/"+id+".xml ";

please help  very urgernt

Thanks
Johnson