tell me please where is mistake?

[knuzich]

tell me please where is mistake?  i'am trying create sandbox campaign
in .NET
instead of "my-google-email" i enter my real email, "my-google-
password" replaced by my real password.
It is all.  webRequest.GetResponse()  return error  500 ("inner server
error")

public static void CreateCampaign()
    {
        //https://sandbox.google.com/api/adwords/v13/CampaignService?
wsdl
        //https://sandbox.google.com/api/adwords/v13
        //https://adwords.google.com/api/adwords/cm/v200909
        string authToken = GetAuthToken();
        string requestXml = string.Format(@"
      <?xml version='1.0' encoding='utf-8'?>
      <soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/
envelope/'
          xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
          xmlns:xsd='http://www.w3.org/2001/XMLSchema'>
        <soap:Header>
          <RequestHeader xmlns='https://sandbox.google.com/api/adwords/
v13'>
            <applicationToken>{0}</applicationToken>
            <authToken>{1}</authToken>
            <clientEmail>{2}</clientEmail>
            <developerToken>{3}</developerToken>
            <userAgent>{4}</userAgent>
          </RequestHeader>
        </soap:Header>
        <soap:Body>
          <mutate xmlns='https://sandbox.google.com/api/adwords/v13'>
            <operations>
              <operator>ADD</operator>
              <operand>
                <name>Interplanetary Cruise#111</name>
                <status>PAUSED</status>
                <budget>
                  <period>DAILY</period>
                  <amount>
                    <microAmount>50000000</microAmount>
                  </amount>
                  <deliveryMethod>STANDARD</deliveryMethod>
                </budget>
                <biddingStrategy xsi:type='ManualCPC' />
              </operand>
            </operations>
          </mutate>
        </soap:Body>
      </soap:Envelope>",
             "", authToken, "",
            "my-google-email++USD", "somewords").Trim();

        WebRequest webRequest = HttpWebRequest.Create(
            "https://sandbox.google.com/api/adwords/v13/
CampaignService");
        webRequest.Method = "POST";
        webRequest.ContentType = "text/xml; charset=utf-8";
        webRequest.Headers.Add("SOAPAction", "");
        byte[] postBytes = Encoding.UTF8.GetBytes(requestXml);
        webRequest.ContentLength = postBytes.Length;

        using (Stream strmReq = webRequest.GetRequestStream())
        {
            strmReq.Write(postBytes, 0, postBytes.Length);
        }
        try
        {
            WebResponse response = webRequest.GetResponse();

        }
        catch (WebException ex)
        {
            throw new ApplicationException("Could not make Api call.",
ex);
        }
    }



Here GetAuthToken() is


private static string GetAuthToken()
    {
        WebRequest webRequest = HttpWebRequest.Create("https://
www.google.com/accounts/ClientLogin");
        webRequest.Method = "POST";
        webRequest.ContentType = "application/x-www-form-urlencoded";

        string postParams =
            "accountType=" + HttpUtility.UrlEncode("GOOGLE") +
            "&Email=" + HttpUtility.UrlEncode("my-google-email") +
            "&Passwd=" + HttpUtility.UrlEncode("my-google-password") +
            "&service=" + HttpUtility.UrlEncode("adwords") +
            "&source=" + HttpUtility.UrlEncode(string.Format("{0}-{1}-
{2}", "YOUR_COMPANY_NAME",
                "YOUR_APP_NAME", "YOUR_VERSION_ID"));

        byte[] postBytes = Encoding.UTF8.GetBytes(postParams);
        webRequest.ContentLength = postBytes.Length;

        using (Stream strmReq = webRequest.GetRequestStream())
        {
            strmReq.Write(postBytes, 0, postBytes.Length);
        }

        string retVal = "";
        try
        {
            WebResponse response = webRequest.GetResponse();

            using (StreamReader reader = new
StreamReader(response.GetResponseStream()))
            {
                string sResponse = reader.ReadToEnd();
                string[] splits = sResponse.Split('\n');
                foreach (string split in splits)
                {
                    string[] subsplits = split.Split('=');
                    if (subsplits.Length >= 2 && subsplits[0] ==
"Auth")
                    {
                        retVal = subsplits[1];
                    }
                }
            }
        }
        catch (WebException ex)
        {
            throw new ApplicationException("Could not generate auth
token.", ex);
        }
        return retVal;
    }

what is wrong here?

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