How do I use HttpWebResponse/Request

Here is the Program Code.

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Xml;

namespace GeocodeDataFlowExample
{
//A summary of status information returned in the response when you check
// job status.
class DownloadDetails
{
public string jobStatus { get; set; }
public string suceededlink { get; set; }
public string failedlink { get; set; }

}

class Program
{
//Creates a geocode dataflow job and uploads spatial data to process.
//Parameters:
// dataFilePath: The path to the file that contains the spatial data to geocode.
// dataFormat: The format of the input data. Possible values are xml, csv, tab and pipe.
// key: The Bing Maps Key to use for this job. The same key is used to get job status and download results.
// description: Text that is used to describe the geocode dataflow job.
//Return value : A URL that defines the location of the geocode dataflow job that was created.
static string CreateJob(string dataFilePath, string dataFormat, string key, string description)
{
//Define parameters for the HTTP request
//
// The 'Content-Type' header of the HTTP Request must be "text/plain" or "application/xml"
// depending on the input data format.
//
string contentType = "text/plain";
if (dataFormat.Equals("xml", StringComparison.OrdinalIgnoreCase))
contentType = "application/xml";

StringBuilder queryStringBuilder = new StringBuilder();

//
// The 'input'(input format) and 'key' (Bing Maps Key) parameters are required.
//
queryStringBuilder.Append("input=").Append(Uri.EscapeUriString(dataFormat));
queryStringBuilder.Append("&");
queryStringBuilder.Append("key=").Append(Uri.EscapeUriString(key));

if (!String.IsNullOrEmpty(description))
{
//
// The 'description' parameter is optional.
//
queryStringBuilder.Append("&");
queryStringBuilder.Append("description=").Append(Uri.EscapeUriString(description));
}

//Build the HTTP URI that will upload and create the geocode dataflow job
UriBuilder uriBuilder = new UriBuilder("http://spatial.virtualearth.net");
uriBuilder.Path = "/REST/v1/dataflows/geocode";
uriBuilder.Query = queryStringBuilder.ToString();

//Include the data to geocode in the HTTP request
using (FileStream dataStream = File.OpenRead(dataFilePath))
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uriBuilder.Uri);

//
// The HTTP method must be 'POST'.
//
request.Method = "POST";
request.ContentType = contentType;

using (Stream requestStream = request.GetRequestStream())
{
byte[] buffer = new byte[16384];
int bytesRead = dataStream.Read(buffer, 0, buffer.Length);
while (bytesRead > 0)
{
requestStream.Write(buffer, 0, bytesRead);

bytesRead = dataStream.Read(buffer, 0, buffer.Length);
}
}

//Submit the HTTP request and check if the job was created successfully.
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
//
// If the job was created successfully, the status code should be
// 201 (Created) and the 'Location' header should contain a URL
// that defines the location of the new dataflow job. You use t