How to work ReSTFul API and C# application?

[rithyph]

I search it from other friend, but I cannot work too and have message no permission to access this web service.

private void button1_Click(object sender, EventArgs e)
        {
try
            {
                Uri uri = new Uri("http://localhost:8080/qcbin/authentication-point/authenticate");
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
                request.Method = "POST";
                NetworkCredential credentials = new NetworkCredential("user", "password");
                request.Credentials = credentials;
 
                WebResponse v = request.GetResponse();
                Stream rStream = v.GetResponseStream();
                StreamReader str = new StreamReader(rStream);
                if (str.EndOfStream != true)
                {
                    richTextBox1.Text = str.ReadToEnd();
 
                }
                v.Close();
                rStream.Close();
                str.Close();
                richTextBox1.Text = "success";
 
            }
 
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK);
            }     
        }