Is WebRequest The Right C# Tool For Interacting With Websites?

HttpWebRequest req = (HttpWebRequest)
WebRequest.Create("http://mysite.com/index.php");
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
string postData = "var=value1&var2=value2";
req.ContentLength = postData.Length;

StreamWriter stOut = new
StreamWriter(req.GetRequestStream(),
System.Text.Encoding.ASCII);
stOut.Write(postData);
stOut.Close();

using (WebClient client = new WebClient ())
{
    //manipulate request headers (optional)
    client.Headers.Add (HttpRequestHeader.UserAgent, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");

    //execute request and read response as string to console
    using (StreamReader reader = new StreamReader(client.OpenRead(targetUri)))
    {
        string s = reader.ReadToEnd ();
        Console.WriteLine (s);
    }
}