how to use Graph Api for deleting an object

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C#

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 try 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 5th line "The remote server returned an error: (400) Bad Request." ,

Please reply how to solve this.

Thank you.