BeginInvoke update control at end of operation

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C#

I am doing file copy program with progress bar showing file copied progress.I have created thread which will do the file reading and writing work.

public partial class FileCopy : Form
{
  onStartButtonClick()
  {
      Thread fileReaderWriter = new Thread(new ThreadStart(doFileCopy));
      fileReaderWriter.Start();
  }
  doFileCopy()
  {
    while(file.length> 0)
    {
      //read data 
      //write data
      reportProgress(someValue);
    }
   MessageBox.show("File Copied");
   disableControl();
  }
  private void disableControl()
  {
    progressbar1.hide();
  }
   private void ReportProgress(int _nValue)
        {
            progressBar1.BeginInvoke((Action)(() =>
            {
                progressBar1.Value = _nValue;
                progressBar1.Update();
            }));

            label4.BeginInvoke((Action)(() =>
            {
                label4.Text = " some Text";
            }));

            label5.BeginInvoke((Action)(() =>
            {
                label5.Text = " Time remaining  " + _lTimeRemaining + " s";
            }));       
        }
}
<pre>
Progress bar is get updated its not hiding the progressbar after file copied message.It get hange on disableControl() method.How can I hide progress bar?