title: Cross-thread operation not valid in Windows Forms
body: <p>Could anyone help me i have a problem I'm trying to get this code to work in the background via threadpool but i cannot seem to get it to work i keep getting this error:</p>
  
  <pre><code>Cross-thread operation not valid: Control 'ListBox3' accessed
  from a thread other than the thread it was created on. 
  </code></pre>
  
  <p>Here is the code i am using:</p>
  
  <pre><code>private void DoWork(object o)
  {
      var list = ListBox3;
  
      var request = createRequest(TxtServer.Text, WebRequestMethods.Ftp.ListDirectory);
  
      using (var response = (FtpWebResponse)request.GetResponse())
      {
          using (var stream = response.GetResponseStream())
          {
              using (var reader = new StreamReader(stream, true))
              {
                  while (!reader.EndOfStream)
                  {
                      list.Items.Add(reader.ReadLine());
                      ResultLabel.Text = "Connected";
                  }
              }
          }
      }
  }
  </code></pre>