title: WebRequest 400 bad request to api
body: <p>I am making webrequest to instagram api, and recieving 400 bad request, but i guess this is not something specific to instagram and is a generic error in my code.
  here is my code."code" paramter in this request is obtained from previous request.Code breaks at "GetResponse" method</p>
  
  <pre><code>  string clientID = "myclientid";
    string clientsecret="myclientsecret";
    string redirectURL = "http://localhost:64341/"; 
   string webrequestUri = "https://api.instagram.com/oauth/
    access_token?  client_id=" + clientID + "&amp;client_secret=
    " + clientsecret +   "&amp;grant_type=authorization_code"                                            + "&amp;redirect_uri="redirectURL+"&amp;code="
  +Request.QueryString["code"].ToString();
  WebRequest request = WebRequest.Create(webrequestUri);
  request.Method = "POST";
  WebResponse response = request.GetResponse();
  </code></pre>