How do I know if the data I pushed or pinged is received?

Question

Hi,

I do not know if my question is correct but can you guys help me with my code. I pinged(dont know if that's the correct term for that) a website let's say samplewebite.com (just a sample) using the code below.  Now what will I insert or what code do I have to insert or what do I have to do to check if that webite received the data i pushed or did I pushed the data with this code? please help.

Thanks in advance.

 private void btnLogin_Click(object sender, EventArgs e)

        {

            string username = this.txtUsername.Text;

            string password = this.txtPassword.Text;

            using (var client = new WebClient())

            {

                client.Credentials = new NetworkCredential(username, password);

                client.DownloadString("http://samplewebite.us/");

            }

            this.Dispose();

        }