Issue With HTTP Post to web service

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C#

HTTP

webservice

I am having trouble figuring out how posting to a web service works. I have the following code inside my console app(client).

// Create a request using a URL that can receive a post. 
            WebRequest request = WebRequest.Create("http://tempuri.org/HelloWorld");
            // Set the Method property of the request to POST.
            request.Method = "POST";
            // Create POST data and convert it to a byte array.
            string postData = "This is a test that posts this string to a Web server.";
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            // Set the ContentType property of the WebRequest.
            request.ContentType = "application/x-www-form-urlencoded";
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            // Get the request stream.
            Stream dataStream = request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close();
            // Get the response.
            WebResponse response = request.GetResponse();
            // Display the status.
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd();
            // Display the content.
            Console.WriteLine(responseFromServer);
            // Clean up the streams.
            reader.Close();
            dataStream.Close();
            response.Close();

And it seems to be running fine. And here is my code from my web service.

namespace WebService1
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    // [System.Web.Script.Services.ScriptService]
    public class Service1 : System.Web.Services.WebService
    {
       

        [WebMethod]
        public string HelloWorld(string postData)
        {
            return postData;
            
        }

        
    }

}

Which also seems to be running fine. But when I post from the client i am not seeing the information on the web service. I do not know much about web services so it could be something simple. I am able to invoke the hello world method and enter a string value and then see the correct xml data but i'm not really sure where or how to see the data that i'm posting from the client. Please help and keep in mind that i'm a complete newbie. Thanks in Advance!