C#

private void GenerateReport(string Html, HttpContext context)
        {
            MemoryStream stream = createPDF(Html);

            context.Response.ContentType = "application/pdf";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=\"Report.pdf\"");
            context.Response.BinaryWrite(stream.ToArray());
       
        }

        private MemoryStream createPDF(string html)
        {
            MemoryStream msOutput = new MemoryStream();
            TextReader reader = new StringReader(html);

            Document document = new Document(PageSize.A4,10f,10f,10f,0f);
            
            PdfWriter writer = PdfWriter.GetInstance(document, msOutput);

            HTMLWorker worker = new HTMLWorker(document);
    
            document.Open();
            worker.StartDocument();

            worker.Parse(reader);
            worker.EndDocument();
            worker.Close();
            document.Close();

            return msOutput;
        }

private void btnCaptureScreen_Click(object sender, EventArgs e) {
  if (LIST_CheckedTreeNodes.Count > 0) {
     btnCaptureScreen.Enabled = false; /*button that runs this operation*/
     btnSTOP.Enabled = true;  /*Stop button for stopping operation*/
     abort_process = false;   /*global variable I tried to use for breaking out of loops*/
	
     thread = new Thread(delegate() {
          foreach (iTreeNode node in LIST_CheckedTreeNodes) {
	       if (abort_process) break;

	       this.BeginInvoke((ThreadStart)delegate() {
	            CaptureScreenFromNode(node);
	       });

	       if (abort_process) break;
	  }
	
          /*after thread is done, restore everything to normal state*/				
	  this.BeginInvoke((ThreadStart)delegate() {
		btnCaptureScreen.Enabled = true;
		btnSTOP.Enabled = false;		
	  });
	  Thread.Sleep(10);
     });
     thread.Start();
  }
}

private void CaptureScreenFromNode(iTreeNode node) {
     treeView.SelectedNode = node;
     
/*** Node property information ***/
     string nodePI = node.GetType().GetProperty("iDiagramType").GetValue(node).ToString();
           foreach (iComboBox combo in LIST_COMBOX_SelectedLoadCases) {
		if (abort_process) break;
                Check_Selected_Load_Cases(combo);
                /*** Combobox property information ***/
		string comboPI = combo.GetType().GetProperty("iDiagramType").GetValue(combo).ToString();
/*** Loop has found appropriate combobox with selected load cases ***/
		if (comboPI == nodePI) {
			if (combo.Items.Count > 0) {
				for (int j = 0; j < combo.Items.Count; j++) {
				     if (abort_process) break;
				     /*** DO SOME WORK ***/
				}
			}
			else {
                             /*** DO SOME OTHER WORK ***/}
			}
		}
	} /*end of foreach*/
}

protected override void OnStart(string[] args) 
        {            
            System.Timers.Timer time = new System.Timers.Timer();
            time.Start();
            time.Interval = (1000 * 60 * 5); //5 minutes
            time.Elapsed += new ElapsedEventHandler(time_elapsed);
            time.AutoReset = true;
            time.Start();            
        }
        
        public void time_elapsed(object sender, ElapsedEventArgs e)
        {
            DateTime scheduledRun = DateTime.Today.AddHours(13.20);    
            DateTime lastRan = lastTime.LastWriteTime;
            if (DateTime.Now > scheduledRun)
            {
                TimeSpan sinceLastRun = DateTime.Now - lastRan;
                if (sinceLastRun.Minutes > 5)
                {
                    importFrmURL("http:// ..", "@"\Import1.txt"");                    
                }
            }
        }

 public void importFrmURL(string url, string dir) // dir = @"\Import1.txt"
 {
 System.IO.StreamWriter fileWriter;
 fileWriter = new System.IO.StreamWriter(dir); //<---PROBLEM------ hang there
 try
 { 
 var client = new WebClient();
 using (var stream = client.OpenRead(url)) 
 using (var reader = new StreamReader(stream))
 {
 string line;
 while ((line = reader.ReadLine()) != null)
 {
 fileWriter.WriteLine(line);
 }
 fileWriter.Close();
 }//---------------------------------------------------------------------------------
 }
 catch (Exception e)
 {
 eventLog1.WriteEntry("Error occurred!\n\r" + e.ToString());//<---DEBUG
 } 
 }