why HttpWebRequest runs the target page twice?
<p>I use following code for posting data to <code>default2.aspx</code> page. but when I trace the <code>default2.aspx</code> page it runs twice and I encounter error. 
What's wrong with my code?</p>

<pre><code>string url = "http://localhost:3629/WebSite6/Default2.aspx";
        StringBuilder postData = new StringBuilder();
        postData.Append("first_name=" + HttpUtility.UrlEncode("Raymond") + "&amp;");
        postData.Append("last_name=" + HttpUtility.UrlEncode("Sanaz"));
        StreamWriter writer = null;
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = postData.ToString().Length;
        try
        {
            writer = new StreamWriter(request.GetRequestStream());
            writer.Write(postData.ToString());
        }
        finally
        {
            if (writer != null)
                writer.Close();
        }

        Response.Redirect("http://localhost:3629/WebSite6/Default2.aspx");
</code></pre>

<p>Default2.aspx:</p>

<pre><code>protected void Page_Load(object sender, EventArgs e)
    {
     s= Request.Form["first_name"].ToString();
    }
</code></pre>
