C#

static void Main()
{
  int i = 1;
  NoRef(i);
  Console.WriteLine(i); // prints '1'

  WithRef(ref i);
  Console.WriteLine(i); // prints '2'
}

static void NoRef(int i)
{
 i = i +1;
}

static void WithRef(ref int i)
{
 i = i + 1;
}

static void Main()
{
   int i = 0;
   SetOut(out i);
   Console.WriteLine(i); // prints '1'
}

static vouid SetOut(out int i)
{
 i = 1;
}

private void button1_Click(object sender, EventArgs e) {
            progress prg = new progress();
            Thread t = new Thread(new ParameterizedThreadStart(loop));
            t.Start(prg);
            prg.ShowDialog();
        }

        delegate void ProgressCloseInvoker(progress prg);
        public void loop(object obj) {

            progress prg = obj as progress;
            for (long i = 0; i < 500000000; i++) {
                
            }
            // finished. closing the progress
            this.BeginInvoke(new ProgressCloseInvoker(CloseProgress), prg);
        }

        public void CloseProgress(progress prg) {
            prg.Close();

        }

N a v a n e e t h wrote:

prg.ShowDialog() in the "Loop" method blocks the current thread, which means your loop won't get executed until the progress closes.

S. Senthil Kumar wrote:

the OP is using BeginInvoke

Mogaambo wrote:

But what does the exactly invokerequired

George_George wrote:

Http authentication

HttpWebRequest request = WebRequest.Create(new Uri("http://somewebsite.com"));
request.Credentials = new NetworkCredential("username", "password");

George_George wrote:

if the web site has some customized certificate, or the end user (e.g. my Http client) has some customized certificate,