Rest Api v1.1 Query Building, HELP?

[tsearchhero]

Hello my friends,

I am writing a simple application that collects tweets using twitter rest api v1.1.
There is a function below and this function takes a query as a parameter. Here is the problem. If query has one parameter there is no problem. Tweets are fetched perfectly. But when I try to send a query includes more than one parameters then empty results come up…I am encoding parameters due to twitter documentation but I am still have this problem…

Here is the code block:

void getTweets(string resource_url, string q)
        {
            // oauth application keys

            var oauth_token = "mytoken";
            var oauth_token_secret = "mytoken-scret";
            var oauth_consumer_key = "myconsumer key";
            var oauth_consumer_secret = "myconsumer secret";

            // oauth implementation details
            var oauth_version = "1.0";
            var oauth_signature_method = "HMAC-SHA1";

            // unique request details
            var oauth_nonce = Convert.ToBase64String(
                new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
            var timeSpan = DateTime.UtcNow
                - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
            var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();


            // create oauth signature
            var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
                            "&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&q={6}";

            var baseString = string.Format(baseFormat,
                                        oauth_consumer_key,
                                        oauth_nonce,
                                        oauth_signature_method,
                                        oauth_timestamp,
                                        oauth_token,
                                        oauth_version,
                                        Uri.EscapeDataString(q)
                                        );

            baseString = string.Concat("GET&", Uri.EscapeDataString(resource_url), "&", Uri.EscapeDataString(baseString));

            var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret),
                                    "&", Uri.EscapeDataString(oauth_token_secret));

            string oauth_signature;
            using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
            {
                oauth_signature = Convert.ToBase64String(
                    hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
            }

            // create the request header
            var headerFormat = "OAuth oauth_nonce=\"{0}\", oauth_signature_method=\"{1}\", " +
                               "oauth_timestamp=\"{2}\", oauth_consumer_key=\"{3}\", " +
                               "oauth_token=\"{4}\", oauth_signature=\"{5}\", " +
                               "oauth_version=\"{6}\"";

            var authHeader = string.Format(headerFormat,
                                    Uri.EscapeDataString(oauth_nonce),
                                    Uri.EscapeDataString(oauth_signature_method),
                                    Uri.EscapeDataString(oauth_timestamp),
                                    Uri.EscapeDataString(oauth_consumer_key),
                                    Uri.EscapeDataString(oauth_token),
                                    Uri.EscapeDataString(oauth_signature),
                                    Uri.EscapeDataString(oauth_version)
                            );



            ServicePointManager.Expect100Continue = false;

            // make the request
            var postBody = "q=" + Uri.EscapeDataString(q);//
            resource_url += "?" + postBody;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);

            richQuery.Text = resource_url;

            request.Headers.Add("Authorization", authHeader);
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";
            var response = (HttpWebResponse)request.GetResponse();
            var reader = new StreamReader(response.GetResponseStream());
            var objText = reader.ReadToEnd();

           ...app specific codes here...
}

And, in button click function, I am just calling this function…

                string url = "https://api.twitter.com/1.1/search/tweets.json";
                getTweets(url, query);

if my query is equal to - for example - https://api.twitter.com/1.1/search/tweets.json?q=ferrari then there is no problem
but if it is equal to: https://api.twitter.com/1.1/search/tweets.json?q=ferrari%26lang%3Dtr then there is no results…[https://api.twitter.com/1.1/search/tweets.json?q=ferrari&lang=tr]

I am building a query and encoded it. Where is the problem?
Please help…

Thanks…