OpenWriteCompletedEventArgs Class

public static void OpenResourceForPosting (string address)
{
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    // Specify that the OpenWriteCallback method gets called 
    // when the writeable stream is available.
    client.OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
    client.OpenWriteAsync (uri);
    // Applications can perform other tasks 
    // while waiting for the upload to complete.
}

void OpenResourceForPosting (String* address)
{
    WebClient* client = new WebClient ();

    // Specify that the OpenWriteCallback method gets called
    // when the writeable stream is available.
    client->OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
    client->OpenWriteAsync (address);
    // Applications can perform other tasks
    // while waiting for the upload to complete.
}

private static void OpenWriteCallback2 (Object sender, OpenWriteCompletedEventArgs e)
{
    Stream body = null;
    StreamWriter s = null;

    try
    {
        body = (Stream)e.Result;
        s = new StreamWriter (body);
        s.AutoFlush = true;
        s.Write ("This is content data to be sent to the server.");
    }
    finally
    {
        if (s != null)
        {
            s.Close ();
        }

        if (body != null)
        {
            body.Close ();
        }
    }
}

void OpenWriteCallback2 (Object* /*sender*/, OpenWriteCompletedEventArgs* e)
{
    Stream* body = 0;
    StreamWriter* s = 0;

    try
    {
        body = dynamic_cast<Stream*>(e->Result);
        s = new StreamWriter (body);
        s->AutoFlush = true;
        s->Write (S"This is content data to be sent to the server.");
    }
    __finally
    {
        if (s != 0)
        {
            s->Close ();
        }

        if (body != 0)
        {
            body->Close ();
        }
    }
}