ASP.Net Post Tweet to Twitter: The remote server returned an error: (401) Unauthorized.

Hi,

I am using twitter api to post messages.

In apps section of twitter under website i have written http://staging10.techaheadcorp.com/snakkoo/

and in callback URL http://staging10.techaheadcorp.com/snakkoo/home

But when i am trying to post some message, it is showing error

The remote server returned an error: (401) Unauthorized.

at this line

twitter.Tweet("Hi ! This is a test message");

I am checking throug live website as twitter doesn't allow local host.

My API_Key- rkghuiVA2g4IdN4JqWjVXb0Qi API_Secret = dAKPjRQH6JBruRM28DYMOpgS4Cd7VMi9GLMFiCkgpyUcH5KjEJ

you can check it out here

http://staging10.techaheadcorp.com/snakkoo/tweet/TwitterPostMessages.aspx

Please correct me where i am doing wrong