I am programing in c# and trying to get token using OAuth request_token and getting error 401 all the time
this is the request I am making to the server : POST HTTP/1.1

Content-Type: application/x-www-form-urlencoded

Authorization: OAuth oauth_callback=“oob”, oauth_consumer_key=“PEEXictMap1JAL14sHVPaYzLo”, oauth_nonce=“NjM1NTYzMzQzNDE3NjQyNzk1”, oauth_signature=“1z%252BDUu8uehhw0yRvQgWJRYCXBnw%253D”, oauth_signature_method=“HMAC-SHA1”, oauth_timestamp=“1420730342”, oauth_version=“1.0”

what am I missing here?