how to use graph API for facebook

hi I m working on c# .net web application.I m using Facebook API for retrieving data from Facebook account. Now i want to delete wall post or inbox messages through API. i saw that it can be done by graph api through deleting object. I tried this:

 string token1 = api.Auth.CreateToken();

 string sURL = "https://graph.facebook.com/Post_id?token=" + token + "&method=delete";

 WebRequest request = WebRequest.Create(sURL);

 request.Method = "POST";

 HttpWebResponse response = (HttpWebResponse)request.GetResponse();


but it gives an error in fourth line "The remote server returned an error: (400) Bad Request." ,

Can someone please suggest what might be causing this?
bond1980Asked:
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