title: C# Progressbar won't update with backgroundworker
body: <p>I am trying to update my progressbar with the backgroundworker. Only this aint working. Here's my code:</p>
  
  <pre><code>private BackgroundWorker _worker;
  
  public Form1(string[] args)
  {
      InitializeComponent();
  
      // Backgroundworker to update the progressbar
      _worker = new BackgroundWorker();
      _worker.WorkerReportsProgress = true;
      _worker.ProgressChanged += worker_ProgressChanged;
      _worker.DoWork += worker_DoWork;
      _worker.RunWorkerCompleted += worker_WorkCompleted;
  
  }
  
  private void worker_DoWork(object sender, DoWorkEventArgs e)
  {
      SendItems();
  }
  private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
  {
      progressBar1.Value = e.ProgressPercentage;
  }
  private void worker_WorkCompleted(object sender, RunWorkerCompletedEventArgs e)
  {
      _running = false;
      HandleGui();
  }
  
  private bool SendItems()
  {
      try
      {
          GetEvaluationDocumentsToSend();
          _worker.ReportProgress(16);
  
          GetModifiedEvaluationDocumentsToSend();
          _worker.ReportProgress(32);
  
          GetTasksToSend();
          _worker.ReportProgress(48);
  
          GetPostToSend();
          _worker.ReportProgress(64);
  
          GetContractDocumentsToSend();
          _worker.ReportProgress(80);
  
          GetModifiedContractDocumentsToSend();
          _worker.ReportProgress(100);
  
          return true;
      }
      catch (Exception e)
      {
          Log.WriteLog(e.ToString());
  
          MessageBox.Show(
              "The following error occured while sending the items: \r\n" + e.ToString(),
              "Error",
              MessageBoxButtons.OK,
              MessageBoxIcon.Exclamation);
  
          return false;
      }
  }
  
  private void btnUpdate_Click(object sender, EventArgs e)
  {
      _worker.RunWorkerAsync();
  }
  </code></pre>
  
  <p>I don't get any errors, but my progressbar will not update. What am I doing wrong?</p>