C# HTTP POST Request Configuration to submit a FORM on DRUPAL website

Drupal based form generates form_token which it stores against each unique session and uses it to validate the form when submitted. i am able to get the form_token and i am submitting the right parameters too, But every attempt to submit the form using HTTPWEBREQUEST (POST) using C# leads to a message :FORM IS OUTDATED, PLEASE SAVE ANY WORK AND RELOAD I am hoping drupal experts can share some insight as to what the request headers should be, anything related to cache or cookies (I have checked cookies and they are just fine). More Information will be shared with shortlisted candidates via PM