...
framework = new SoapClient(binding, endpoint);
framework.ClientCredentials.UserName.UserName = userName;
framework.ClientCredentials.UserName.Password = password;
...

public Result Extract(string campaignid, DateTime startDate, DateTime endDate)
    {
        ExtractRequest request = new ExtractRequest();
        ExtractRequest[] requests = new ExtractRequest[1];
        List<ExtractParameter> extractParameters = new List<ExtractParameter>();
        ExtractParameter extractParam = null;


        request = new ExtractRequest();


        requests = new ExtractRequest[1];


        extractParameters = new List<ExtractParameter>();

        // This is a constant value used to identify the desired extract.  This is required.  This values is for "Tracking Extract"

        request.ID = "c7219016-a7f0-4c72-8657-1ec12c28a0db";

        extractParam = new ExtractParameter();
        extractParam.Name = "StartDate";
        extractParam.Value = startDate.Date.ToString();
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "EndDate";
        extractParam.Value = endDate.Date.ToString();
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractOpens";
        extractParam.Value = "true";   // Get opens, set to false to not return opens
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractClicks";
        extractParam.Value = "true"; // Get clicks, set to false to not return clicks
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractSent";
        extractParam.Value = "true"; // Get sent events, set to false to not return sent envents
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractUnsubs";
        extractParam.Value = "true";  // Get unsubscribes, set to false to not return unsubscribes.
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractConversions";
        extractParam.Value = "false";  // Get conversion events, set to false to not return conversions.
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractSurveyResponses";
        extractParam.Value = "false";  // Get survey respones, set to false to not return survey respones.
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractBounces";
        extractParam.Value = "true";  // Get bounces, set to false to not reutrn bounces.
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractSubscribers";
        extractParam.Value = "false";  // Get subscribers, set to false to not return subscribers.
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "ExtractSendJobs";
        extractParam.Value = "false";  // Get sends, set to false to not return sends
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "QuoteText";
        extractParam.Value = "true";  // Quote the text
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "OutputFileName";
        extractParam.Value = String.Format("tracking_{0}.zip", campaignid);
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "Format";
        extractParam.Value = "csv";
        extractParameters.Add(extractParam);

        extractParam = new ExtractParameter();
        extractParam.Name = "EmailSendDefinitionExternalKey";
        extractParam.Value = campaignid;
        extractParameters.Add(extractParam);


        request.Parameters = extractParameters.ToArray();
        requests[0] = request;

        string requestID = String.Empty;
        string overallResult = String.Empty;
        ExtractResult[] responses;

        overallResult = framework.Extract(requests, out requestID, out responses);

        if (overallResult == "OK")
            return new Result(true, overallResult);

        return new Result(false, overallResult);
    }