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void BtLoginClick(object sender, EventArgs e)
    {
      string url = "login.php";
      string username = "user";
      string password = "test";
      string parameters = String.Format("pUser={0}&pPwd={1}&pLogin=Anmelden", username, password);
      string response=HttpPost(url, parameters);
      if (response!=null)
        MessageBox.Show(response);
      else
        MessageBox.Show("Response Error");
    }
    
    string HttpPost (string url, string parameters)
    { 
       // parameters: name1=value1&name2=value2  
       WebRequest webRequest = WebRequest.Create (url);
       //string ProxyString = 
       //   System.Configuration.ConfigurationManager.AppSettings
       //   [GetConfigKey("proxy")];
       //webRequest.Proxy = new WebProxy (ProxyString, true);
       //Commenting out above required change to App.Config
       webRequest.ContentType = "application/x-www-form-urlencoded";
       webRequest.Method = "POST";
       byte[] bytes = Encoding.ASCII.GetBytes (parameters);
       Stream os = null;
       try
       { // send the Post
          webRequest.ContentLength = bytes.Length;   //Count bytes to send
          os = webRequest.GetRequestStream();
          os.Write (bytes, 0, bytes.Length);         //Send it
       }
       catch (WebException ex)
       {
          MessageBox.Show ( ex.Message, "HttpPost: Request error", 
             MessageBoxButtons.OK, MessageBoxIcon.Error );
       }
       finally
       {
          if (os != null)
          {
             os.Close();
          }
       }
     
       try
       { // get the response
          WebResponse webResponse = webRequest.GetResponse();
          if (webResponse == null) 
             { return null; }
          StreamReader sr = new StreamReader (webResponse.GetResponseStream());
          return sr.ReadToEnd ().Trim ();
       }
       catch (WebException ex)
       {
          MessageBox.Show ( ex.Message, "HttpPost: Response error", 
             MessageBoxButtons.OK, MessageBoxIcon.Error );
       }
       return null;
    } // end HttpPost 
  }                    

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if (isset($_POST['pLogin']))    // Login-Button geklickt?
            {
                $user=$_POST['pUser'];  // Formulardaten auslesen
                $pwd=$_POST['pPwd'];
                if ($user=="user" && $pwd=="test")    // richtige Zugangsdaten?
                {
                    // Login erfolgreich
                   session_start();
                   <span style="color: red"> $_SESSION['Login_OK']=true;</span>
                    $_SESSION['Benutzername']=$user;
                    header("Location: privat.php"); // weiterleiten zu "privat.php"
                }
            }                    

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Net;
using System.Text;
using System.IO;                    

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string HttpPost (string url, string parameters)
    { 
       // parameters: name1=value1&name2=value2  
       WebRequest webRequest = WebRequest.Create (url);
       HttpWebRequest request = (HttpWebRequest)webRequest;
       CookieContainer cookieContainer = new CookieContainer();
       request.CookieContainer = cookieContainer;
                   ...                    

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   HttpWebRequest request = (HttpWebRequest)webRequest;
   CookieContainer cookieContainer = new CookieContainer();
   request.CookieContainer = cookieContainer;