using HttpWebRequest two or more times via c#

using HttpWebRequest two or more times via c#

I have one problem. I have two methods which use HttpWebRequest. One of
them post a message to my facebook wall. Another take count number of
likes.
Thare is code:
if (Request["code"] == null)
{
Response.Redirect(string.Format(
"https://graph.facebook.com/oauth/authorize?client_id={0}&redirect_uri={1}&scope={2}",
app_id, Request.Url.AbsoluteUri, scope));
}
else
{
Dictionary<string, string> tokens = new Dictionary<string,
string>();
string url =
string.Format(
"https://graph.facebook.com/oauth/access_token?client_id={0}&redirect_uri={1}&scope={2}&code={3}&client_secret={4}",
app_id, Request.Url.AbsoluteUri, scope,
Request["code"].ToString(), app_secret);
HttpWebRequest request = WebRequest.Create(url) as
HttpWebRequest;
using (HttpWebResponse response = request.GetResponse() as
HttpWebResponse)
{
StreamReader reader = new
StreamReader(response.GetResponseStream());
string vals = reader.ReadToEnd();
foreach (string token in vals.Split('&'))
{
//meh.aspx?token1=steve&token2=jake&...
tokens.Add(token.Substring(0, token.IndexOf("=")),
token.Substring(token.IndexOf("=") + 1,
token.Length - token.IndexOf("=") - 1));
}
}
//get wall data
string access_token = tokens["access_token"];
var client = new FacebookClient(access_token);
//post message to my wall or image
dynamic messagePost = new ExpandoObject();
messagePost.message = "I need to get an id of this post";
try
{
var postId = client.Post("me/feed", messagePost);
id_mypost = postId["id"];
}
catch (FacebookOAuthException ex)
{
//handle oauth exception
}
catch (FacebookApiException ex)
{
//handle facebook exception
}
}
This method post message to my wall. Thare is the second method:
if (Response.BufferOutput == true)
{
if (Request["code"] == null)
{
Response.Redirect(string.Format(
"https://graph.facebook.com/oauth/authorize?client_id={0}&redirect_uri={1}&scope={2}",
app_id, Request.Url.AbsoluteUri, scope));
}
else
{
Dictionary<string, string> tokens = new
Dictionary<string, string>();
string url =
string.Format(
"https://graph.facebook.com/oauth/access_token?client_id={0}&redirect_uri={1}&scope={2}&code={3}&client_secret={4}",
app_id, Request.Url.AbsoluteUri, scope,
Request["code"].ToString(), app_secret);
HttpWebRequest request = WebRequest.Create(url) as
HttpWebRequest;
using (HttpWebResponse response =
request.GetResponse() as HttpWebResponse)
{
StreamReader reader = new
StreamReader(response.GetResponseStream());
string vals = reader.ReadToEnd();
foreach (string token in vals.Split('&'))
{
//meh.aspx?token1=steve&token2=jake&...
tokens.Add(token.Substring(0,
token.IndexOf("=")),
token.Substring(token.IndexOf("=") + 1,
token.Length - token.IndexOf("=") - 1));
}
}
string access_token = tokens["access_token"];
var client = new FacebookClient(access_token);
try
{
string str = client.Get("/me/feed").ToString();
JObject obj = JObject.Parse(str);
JToken jUser = obj["data"];
int numb = jUser.Count();
int id_post = 0;
for (int i = 0; i < numb; i++)
{
if (obj["data"][i]["id"].ToString() == id_mypost)
{
id_post = i;
}
}
string strr = obj["data"][id_post]["likes"].ToString();
string pattern = @"id";
int count_like = 0;
Regex newReg = new Regex(pattern);
MatchCollection matches = newReg.Matches(strr);
foreach (Match mat in matches)
{
count_like++;
}
}
catch (Exception)
{
}
}
So thare is the problem. I use two times HttpWebRequest. So , when I bild
my app i got next error: Cannot redirect after HTTP headers have been
sent.
Can somebody help me ?