Post to a web page from a forms application

How to POST to a web page from a windows forms application in C#.

using System.IO;
using System.Net;

// declare & create the URI object that holds the URL of the web page we want to post to.
System.Uri uriDest = new Uri("http://www.sample.com/testpost.aspx");

// declare & create an Http Web Request object using the URI object from above.
System.Net.HttpWebRequest httpReq = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uriDest);

// set the credentials.
httpReq.Credentials = System.Net.CredentialCache.DefaultCredentials;

// set the method to POST
httpReq.Method = "POST";

// set the User Agent. 
// If this is being done from within a web application, the value 
// of the incoming request object could be passed into here, if desired.
httpReq.UserAgent = "Custom App Client";

// Declare the data to be posted.
string sPostData = "this is a test of the emergency broadcasting system.";

// convert the data to a byte array.
byte[] bytArray = Encoding.UTF8.GetBytes(sPostData);

// Set the ContentType property of the WebRequest.
httpReq.ContentType = "application/x-www-form-urlencoded";

// set the content length
httpReq.ContentLength = bytArray.Length;

// Get the request stream.
Stream dataStream = httpReq.GetRequestStream();

// Write the data to the request stream.
dataStream.Write(bytArray, 0, bytArray.Length);

// Close the Stream object.
dataStream.Close();

// Get the response.
WebResponse response = httpReq.GetResponse();
HttpWebResponse objResponseWeb = (HttpWebResponse)response;

// Get the status.
string sStatus = string.Empty;
sStatus = objResponseWeb.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();