Scheduled Tasks in ASP.NET Web Applications using Timers

I'm just found a article that I found on the MSDN blog. And I've just decieded to share on my blog with more explantation.

Before I found this, I honestly had known that the scheduled tasks can be only running on window scheduler tasks.

I had even tried to use Threading with looping to avoid window scheduler tasks on my web application.

Finally, I just found this article .

Scenario: A Web app calls wcf services every one minute. As I'm MVC web developer, my web app is always MVC application. System timer In global.asax, you need to create a Timers method. In below example, I give timer method name to ServiceTimers.

   1:  private void ServiceTimers()

   2:  {

   3:       System.Timers.Timer serivceTimer = new System.Timers.Timer();

   4:       serivceTimer.Enabled = true;

   5:       serivceTimer.Interval = (60000); // one minute

   6:   

   7:       serivceTimer.Elapsed += new

   8:       System.Timers.ElapsedEventHandler(ServiceTimer_Elaspsed);

   9:  }

Within the method, the last line is obviously event handler which call to a event which contains Web service called.

   1:  protected void ServiceTimer_Elaspsed(object sender, System.Timers.ElapsedEventArgs e)

   2:  {

   3:       WorkLoadClient workLoadClient = new WorkLoadClient();

   4:       workLoadClient.DoWork();

   5:  }

All together will be as below in Global.asax

   1:  using System;

   2:  using System.Collections.Generic;

   3:  using System.Linq;

   4:  using System.Web;

   5:  using System.Web.Mvc;

   6:  using System.Web.Routing;

   7:  using NotificationService.Web.ServiceReference2;

   8:   

   9:  namespace NotificationService.Web

  10:  {

  11:      // Note: For instructions on enabling IIS6 or IIS7 classic mode, 

  12:      // visit http://go.microsoft.com/?LinkId=9394801

  13:   

  14:      public class MvcApplication : System.Web.HttpApplication

  15:      {

  16:          public static void RegisterGlobalFilters(GlobalFilterCollection filters)

  17:          {

  18:              filters.Add(new HandleErrorAttribute());

  19:          }

  20:   

  21:          public static void RegisterRoutes(RouteCollection routes)

  22:          {

  23:              routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

  24:   

  25:              routes.MapRoute(

  26:                  "Default", // Route name

  27:                  "{controller}/{action}/{id}", // URL with parameters

  28:                  new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults

  29:              );

  30:   

  31:          }

  32:   

  33:          protected void Application_Start()

  34:          {

  35:              AreaRegistration.RegisterAllAreas();

  36:   

  37:              RegisterGlobalFilters(GlobalFilters.Filters);

  38:              RegisterRoutes(RouteTable.Routes);

  39:   

  40:              ServiceTimers();

  41:          }

  42:   

  43:          private void ServiceTimers()

  44:          {

  45:              System.Timers.Timer serivceTimer = new System.Timers.Timer();

  46:              serivceTimer.Enabled = true;

  47:              serivceTimer.Interval = (60000); // one minute

  48:   

  49:              serivceTimer.Elapsed += new

  50:                  System.Timers.ElapsedEventHandler(ServiceTimer_Elaspsed);

  51:          }

  52:   

  53:          protected void ServiceTimer_Elaspsed(object sender, System.Timers.ElapsedEventArgs e)

  54:          {

  55:              WorkLoadClient workLoadClient = new WorkLoadClient();

  56:              workLoadClient.DoWork();

  57:          }

  58:      }

  59:  }

And I have a WCF service project which referenced by Web app.

   1:  using System;

   2:  using System.Collections.Generic;

   3:  using System.Linq;

   4:  using System.Runtime.Serialization;

   5:  using System.ServiceModel;

   6:  using System.Text;

   7:  using System.Threading;

   8:  using System.Net.Mail;

   9:  using System.Net;

  10:   

  11:  namespace NotificationService.Wcf

  12:  {

  13:     

  14:      public class WorkLoad : IWorkLoad

  15:      {       

  16:          public void DoWork()

  17:          {            

  18:              var client = new SmtpClient("smtp.gmail.com", 587)

  19:              {

  20:                  Credentials = new NetworkCredential("xxxx@gmail.com", "xxxxxx"),

  21:                  EnableSsl = true

  22:              };

  23:   

  24:              client.Send("xxx@gmail.com", "xxxx@email.com", "test", "testbody");

  25:            

  26:          }

  27:          

  28:      }

  29:  }

reference:http://weblogs.asp.net/samirgeorge/archive/2009/05/09/scheduled-task-in-asp-net-web-application-using-timers.aspx