using System;
using System.Net;
using System.Threading;

using System.IO;
namespace Examples.System.Net
{
    public class FtpState
    {
        private ManualResetEvent wait;
        private FtpWebRequest request;
        private string fileName;
        private Exception operationException = null;
        string status;
        
        public FtpState()
        {
            wait = new ManualResetEvent(false);
        }
        
        public ManualResetEvent OperationComplete
        {
            get {return wait;}
        }
        
        public FtpWebRequest Request
        {
            get {return request;}
            set {request = value;}
        }
        
        public string FileName
        {
            get {return fileName;}
            set {fileName = value;}
        }
        public Exception OperationException
        {
            get {return operationException;}
            set {operationException = value;}
        }
        public string StatusDescription
        {
            get {return status;}
            set {status = value;}
        }
    }
    public class AsynchronousFtpUpLoader
    {  
        // Command line arguments are two strings:
        // 1. The url that is the name of the file being uploaded to the server.
        // 2. The name of the file on the local machine.
        //
        public static void Main(string[] args)
        {
            // Create a Uri instance with the specified URI string.
            // If the URI is not correctly formed, the Uri constructor
            // will throw an exception.
            ManualResetEvent waitObject;
            
            Uri target = new Uri (args[0]);
            string fileName = args[1];
            FtpState state = new FtpState();
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(target);
            request.Method = WebRequestMethods.Ftp.UploadFile;
            
            // This example uses anonymous logon.
            // The request is anonymous by default; the credential does not have to be specified. 
            // The example specifies the credential only to
            // control how actions are logged on the server.
            
            request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com");
            
            // Store the request in the object that we pass into the
            // asynchronous operations.
            state.Request = request;
            state.FileName = fileName;
            
            // Get the event to wait on.
            waitObject = state.OperationComplete;
            
            // Asynchronously get the stream for the file contents.
            request.BeginGetRequestStream(
                new AsyncCallback (EndGetStreamCallback), 
                state
            );
            
            // Block the current thread until all operations are complete.
            waitObject.WaitOne();
            
            // The operations either completed or threw an exception.
            if (state.OperationException != null)
            {
                throw state.OperationException;
            }
            else
            {
                Console.WriteLine("The operation completed - {0}", state.StatusDescription);
            }
        }
        private static void EndGetStreamCallback(IAsyncResult ar)
        {
            FtpState state = (FtpState) ar.AsyncState;
            
            Stream requestStream = null;
            // End the asynchronous call to get the request stream.
            try
            {
                requestStream = state.Request.EndGetRequestStream(ar);
                // Copy the file contents to the request stream.
                const int bufferLength = 2048;
                byte[] buffer