Having trouble implementing Yahoo BOSS v2 with OAuth in .net/C#

I've been trying to create a simple search page using the Yahoo BOSS v2 api, but cant get OAuth to work properly. I have all the keys etc, and downloaded a C# class for OAuth at http://oauth.googlecode.com/svn/code/csharp/OAuthBase.cs , but I keep getting errors.

We've tried the following:

a javascript function builds a yahoo boss query string and then leads to PageMethods.getYahoo(query string, responseFunction);

Here's the code behind

[WebMethod]  
public static string getYahoo(string url)  
{  
    String result;  
    OAuthBase oauth = new OAuthBase();  
    Uri uri = new Uri("http://mysite.com");  
    string a, qstring = "";  
    string signature = oauth.GenerateSignature(uri, "-my consumer key-", "-my
    secret-", out a, out qstring);  
    url = url.Replace("{oauth}", qstring + "oauth_signature=" + signature);  
    WebResponse objResponse;  
    WebRequest objRequest = System.Net.HttpWebRequest.Create(url);  
    objResponse = objRequest.GetResponse();  
    using (StreamReader sr =
    new StreamReader(objResponse.GetResponseStream()))  
    {  
        result = sr.ReadToEnd();   
        sr.Close();
    }

    return result;
}

here is my GenerateSignature method in oAuthBase class:

public string GenerateSignature(Uri url, string consumerKey, string
    consumerSecret, out string normalizedUrl, out string
    normalizedRequestParameters)
{  
    normalizedUrl = null;  
    normalizedRequestParameters = null;  

    string signatureBase = GenerateSignatureBase(url, consumerKey,null
    ,null,null,GenerateTimeStamp(),GenerateNonce(), HMACSHA1SignatureType, out
    normalizedUrl, out normalizedRequestParameters);  

    HMACSHA1 hmacsha1 = new HMACSHA1();  
    hmacsha1.Key = Encoding.ASCII.GetBytes(string.Format("{0}&{1}",
    UrlEncode(consumerSecret), ""));  

    return GenerateSignatureUsingHash(signatureBase, hmacsha1);  

}  

But we keep getting the error:

Message: Sys.Net.WebServiceFailedException: The开发者_JS百科 server method 'getYahoo' failed
with the following error: System.Net.WebException-- The remote server returned
an error: (401) Unauthorized.
Line: 6934
Char: 21
Code: 0

I hope someone here can help...!

---

You could use my .NET library or looking into the source code of it for using BOSS v2. An example of using the lib you can find here.