C#

<br />
      public delegate void DelegatePictureBoxUpdate();<br />
      public delegate void DelegatePictureBoxLoad(Bitmap image, int nr);<br />
      public delegate void DelegateActualizareStatus();<br />
      public delegate void DelegateActualizareFinal();<br />
<br />
      Thread fir;<br />
		// events used to stop worker thread<br />
	ManualResetEvent m_EventStopThread;<br />
	ManualResetEvent m_EventThreadStopped;<br />
<br />
	// Delegate instances used to cal user interface functions <br />
	// from worker thread:<br />
        public DelegatePictureBoxUpdate m_DelegatePictureBoxUpdate;<br />
        public DelegatePictureBoxLoad m_DelegatePictureBoxLoad;<br />
        public DelegateActualizareStatus m_DelegateStatus;<br />
	public DelegateActualizareFinal m_DelegateFinal;<br />
<br />

	<br />
 public void LoadPictureBox(Bitmap final, int nr)<br />
        {<br />
        	progressInpaint.Maximum=nr;<br />
			progressInpaint.Step= nr/20;<br />
            pctBoxReparat.Image=final;<br />
            lblProprietati.Enabled=true;<br />
            lblProprietati.Text+=":"+nr.ToString();<br />
        }<br />
 public void UpdateStatus()<br />
        {<br />
            progressInpaint.Value+=progressInpaint.Step;<br />
            progressInpaint.Refresh();<br />
        }<br />
<br />
//the form close event<br />
void MainFormFormClosed(object sender, FormClosedEventArgs e)<br />
		{<br />
			<br />
			if ( fir!= null  &&  fir.IsAlive )  // thread is active<br />
			{<br />
				// set event "Stop"<br />
				m_EventStopThread.Set();<br />
<br />
				// wait when thread  will stop or finish<br />
				while (fir.IsAlive)<br />
				{<br />
					// We cannot use here infinite wait because our thread<br />
					// makes syncronous calls to main form, this will cause deadlock.<br />
					// Instead of this we wait for event some appropriate time<br />
					// (and by the way give time to worker thread) and<br />
					// process events. These events may contain Invoke calls.<br />
					if ( WaitHandle.WaitAll(<br />
						(new ManualResetEvent[] {m_EventThreadStopped}), <br />
						100,<br />
						true) )<br />
					{<br />
						break;<br />
					}<br />
<br />
					Application.DoEvents();<br />
				}<br />
			}<br />
		}<br />

 <br />
//load the picture in the pctBox the image appears on the PctBox but after this nothing happend<br />
m_form.BeginInvoke(m_form.m_DelegatePictureBoxLoad, new Object[] {final, nrPuncteDeterioate});<br />
			<br />
//change some pixel and then <br />
<br />
m_form.BeginInvoke(m_form.m_DelegatePictureBoxUpdate,null);<br />
<br />
//at the end of the opperation<br />
m_EventStopped.Set();<br />