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            try
            {
                Uri uri = new Uri("http://www.efireplus.com/forum/login.php");
                string data = "vb_login_username=userid&vb_login_password=password";
                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
                request.Method = WebRequestMethods.Http.Post;
                request.ContentLength = data.Length;
                request.ContentType = "application/x-www-form-urlencoded";
                StreamWriter writer = new StreamWriter(request.GetRequestStream());
                writer.Write(data);
                writer.Close();
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());
                string tmp = reader.ReadToEnd();
                response.Close();
                richTextBox1.AppendText(tmp);               
            }
            catch (Exception ex)
            {
                textBox3.Text = ex.ToString();
            }

<form name="loginfrm" id="loginfrm" action="login.php?do=login" method="post" onsubmit="md5hash_2(vb_login_password, vb_login_md5password, vb_login_md5password_utf, 0);">
 
<input type="text" class="bginput" style="font-size: 11px" name="vb_login_username" id="navbar_username" size="10" accesskey="u" tabindex="101" value="User Name" onblur="myUnTip();" onmouseout="myUnTip();" onfocus="if (this.value == 'User Name') this.value = '';myTip();"   />
 
<input type="password" class="bginput" style="font-size: 11px" name="vb_login_password" id="navbar_password" size="10" tabindex="102" />
 
<input type="submit" class="button" value="Log in" tabindex="104" title="Enter your username and password in the boxes provided to login, or click the 'register' button to create a profile for yourself." accesskey="s" />