using System;
using System.Net;
using System.IO;
using System.Text;
using System.Threading;
 
class HttpWebRequestBeginGetRequest
{
    private static ManualResetEvent allDone = new ManualResetEvent(false);
public static void Main(string[] args)
{
    // Create a new HttpWebRequest object.
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.contoso.com/example.aspx");
 
    request.ContentType = "application/x-www-form-urlencoded";
 
    // Set the Method property to 'POST' to post data to the URI.
    request.Method = "POST";
 
    // start the asynchronous operation
    request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback),request);
 
    // Keep the main thread from continuing while the asynchronous 
    // operation completes. A real world application 
    // could do something useful such as updating its user interface. 
    allDone.WaitOne();
}
 
private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
    HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
 
    // End the operation
    Stream postStream = request.EndGetRequestStream(asynchronousResult);
 
    Console.WriteLine("Please enter the input data to be posted:");
    string postData = Console.ReadLine();
 
    // Convert the string into a byte array. 
    byte[] byteArray = Encoding.UTF8.GetBytes(postData);
 
    // Write to the request stream.
    postStream.Write(byteArray,postData.Length);
    postStream.Close();
 
    // Start the asynchronous operation to get the response
    request.BeginGetResponse(new AsyncCallback(GetResponseCallback),request);
}
 
private static void GetResponseCallback(IAsyncResult asynchronousResult)
{
    HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
 
    // End the operation
    HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
    Stream streamResponse = response.GetResponseStream();
    StreamReader streamRead = new StreamReader(streamResponse);
    string responseString = streamRead.ReadToEnd();
    Console.WriteLine(responseString);
    // Close the stream object
    streamResponse.Close();
    streamRead.Close();
 
    // Release the HttpWebResponse
    response.Close();
    allDone.Set();
}