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Redirect and Post Headers to another application Simultaneously - ASP.Net MVC

I want to redirect a system to a centralized authentication server and I need to fill some parameters in headers and redirect to the authentication server completely. Using Web Client or Web Request I must return a value as a response to the requester ( They work as a listener ).
WebClient Send Request Example:
var values = new NameValueCollection();
values["clientId"] = clientId;
values["clientIP"] = currentIP;
byte[] response;
var resultResponse = string.Empty;
using (var client = new WebClient())
{
try {
response = client.UploadValues(url, values);
resultResponse = Encoding.Default.GetString(response);
}
catch (WebException e)
{
string exception = string.Empty;
if (e.Status == WebExceptionStatus.ProtocolError)
{
exception += ((HttpWebResponse)e.Response).StatusCode;
exception += ((HttpWebResponse)e.Response).StatusDescription;
}
}
}
Web Request Example
string method = "post";
WebRequest req = WebRequest.Create(uri);
req.ContentType = contentType;
req.Method = method;
req.Headers.Add("myhead", value);
req.ContentLength = jsonDataBytes.Length;
var stream = req.GetRequestStream();
stream.Write(jsonDataBytes, 0, jsonDataBytes.Length);
stream.Close();
var response = req.GetResponse().GetResponseStream();
StreamReader reader = new StreamReader(response);
var respo = reader.ReadToEnd();
reader.Close();
response.Close();
return respo;
As you see in both methods the requester post the request and is waiting till receiving the response. I can not return to the requester system until I show two view to the user, get the username and passwords and finally process the information. I need to fill headers in a request, post it to the server and also redirect to the central authentication server. I searched a lot and found that it is impossible to post and redirect at a same time. Can you suggest any other methods to me?

Google OAuth2 token (Bad Request)

I can get the access key just fine, but I'm getting a (400) Bad Request error when attempting to get the token with the following code. I have tried everything. I know the credentials are correct because they work with the Google API Client. That being said, I can't use that because I need this to run in the 3.5 framework. Is there anything glaringly wrong here?
private const string clientId = "1003120056405-ofafvc699hjujp0a9952g8vjaludk90j.apps.googleusercontent.com";
private const string clientSecret = "******************";
private string redirectURI = "urn:ietf:wg:oauth:2.0:oob:auto";
public static AuthResponse Exchange(string authCode, string clientid, string secret, string redirectURI){
try
{
var request = (HttpWebRequest)WebRequest.Create("https://accounts.google.com/o/oauth2/token");
string postData = string.Format("code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type=authorization_code&scope={4}", HttpUtility.UrlEncode(authCode), clientid, secret, redirectURI, "");
var data = Encoding.ASCII.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded; charset=utf-8";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
MessageBox.Show(responseString);
return null;
}
catch (WebException ex)
{
MessageBox.Show(ex.Message);
return null;
}
}

I got this working. The code above was fine, but my accessKey was being converted to lower case by mistake. The key is case sensitive to check out the token.

Get access token from google oauth from code

i used following code to get the access token from code as below
String code = HttpContext.Current.Request["code"];
string redirecturl = HttpContext.Current.Request["url"];
string Url = "https://accounts.google.com/o/oauth2/token";
string grant_type = "authorization_code";
string redirect_uri_encode = UrlEncodeForGoogle(url);
string data = "code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type={4}&access_type={5}";
HttpWebRequest request = HttpWebRequest.Create(Url) as HttpWebRequest;
string result = null;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-www-form-urlencoded";
string param = string.Format(data, code,configurationInfo.oauthclientid , configurationInfo.oauthclientsecretid, redirect_uri_encode, grant_type, "offline");
var bs = Encoding.UTF8.GetBytes(param);
using (Stream reqStream = request.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
}
using (WebResponse response = request.GetResponse())
{
var sr = new StreamReader(response.GetResponseStream());
result = sr.ReadToEnd();
sr.Close();
}
i am getting response as
The remote server returned an error: (400) Bad Request.
i do not know where i went wrong
waiting for your valuable comments

Google also provides a higher level library for accessing its services. I find it makes it much easier to work with its APIs.
http://code.google.com/p/google-api-dotnet-client/

Foursquare SDK for .net

may i know is there any foursquare sdk for .NET C#.
I am doing based on the developer reference but i failed to do it during request for token, i keep on getting the error.
I am using VS 2008 and under development server. I search before this error because of url rewriting, but i'm not hosted in IIS and i also have check the web.config, no luck also. Please help, thanks.
This is my error:
The HTTP verb POST used to access path '/login' is not allowed.
This is my implementation:
HttpWebRequest request = null;
HttpWebResponse response = null;
StreamReader responseStream = null;
ASCIIEncoding ascii = null;
string key = ConfigurationManager.AppSettings["key"];
string secret = ConfigurationManager.AppSettings["secret"];
string callback = ConfigurationManager.AppSettings["callback"];
string obtainTokenUrl = ConfigurationManager.AppSettings["obtainTokenUrl"];
try
{
string postData = "client_id=" + key + "&response_type=code&redirect_uri=" + callback;
ascii = new ASCIIEncoding();
byte[] postBytes = ascii.GetBytes(postData);
try
{
request = WebRequest.Create(obtainTokenUrl) as HttpWebRequest;
}
catch (UriFormatException)
{
request = null;
}
if (request == null)
{
throw new ApplicationException("Invalid URL: " + obtainTokenUrl);
}
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postBytes.Length;
//add post data to request
Stream postStream = request.GetRequestStream();
postStream.Write(postBytes, 0, postBytes.Length);
postStream.Close();
response = (HttpWebResponse)request.GetResponse();
Encoding encode = Encoding.GetEncoding("utf-8");
responseStream = new StreamReader(response.GetResponseStream(), encode);
Response.Write(responseStream.ReadToEnd());

Well, this may be a roundabout sort of answer. But maybe you could check out the open source 4square app for windows phone 7:
http://4square.codeplex.com/
Since you can look at the source code, you can see how they are interfacing with the 4sq API :-)

SharpSquare - FourSquare SDK for .NET http://www.igloolab.com/sharpsquare/

The remote server returned an error: (401) Unauthorized

I'm trying to get the access token from the windows live connect api by using this code
string requestUrl = "https://consent.live.com/AccessToken.aspx";
// Request the access token.
string postData = string.Format("{0}?wrap_client_id={1}&wrap_client_secret={2}&wrap_callback={3}&wrap_verification_code={4}&idtype={5}",
requestUrl,
"000000004C039809",
"l4VJekL1vFL1iFVmcP5qLkWv9ukY4mdl",
"http://ewshops.com",
"dac5d71d-d640-30d1-ebed-3576b132b3ec",
"cid");
byte[] postDataEncoded = System.Text.Encoding.UTF8.GetBytes(postData);
WebRequest req = HttpWebRequest.Create(requestUrl);
req.Method = "POST";
// req.
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = postDataEncoded.Length;
Stream requestStream = req.GetRequestStream();
requestStream.Write(postDataEncoded, 0, postDataEncoded.Length);
WebResponse res = req.GetResponse();
string responseBody = null;
using (StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8))
{
responseBody = sr.ReadToEnd();
}
// Process FORM POST.
NameValueCollection responseCollection = System.Web.HttpUtility.ParseQueryString(responseBody);
return responseCollection["wrap_access_token"];
but I've recieved the following error
The remote server returned an error: (401) Unauthorized.

Show us the response body, it usually contains more information. You should also urlencode http://ewshops.com before adding it to the uri.

I had the same problem and fixed it as follows. Remove the requestUrl ("https://consent.live.com/AccessToken.aspx") and the subsequent "?" from your postData. The POST data should be in x-www-form-urlencoded format and that does not include the request URL. Also HttpUtility.UrlEncode() all the parameters.