ASP.NET

01.//Declaration goes here.
02.Thread SendEmail, CleanOld, MassMailer;
03. 
04.void Application_Start(object sender, EventArgs e)
05.{
06.   //// Code that runs on application startup
07.   SendEmail = new Thread(ArticleEmailTask);
08.   SendEmail.Start();
09.}
10. 
11.void ArticleEmailTask()
12.{
13.    //allow System to load for 5 min.700000
14.    System.Threading.Thread.Sleep(700000);
15.    while (true)
16.    {
17.      if (DateTime.Now.Hour >= 9 && DateTime.Now.Hour <= 10)
18.      {
19.         //Do some Mail sending work
20.      }
21.      else
22.      {
23.        // wait until next time span
24.        System.Threading.Thread.Sleep(3500000);
25.      }
26.    }
27.     
28.}

01.protected void Application_Start(object sender, EventArgs e)
02.{
03.  AddTask("DoStuff", 120);
04.}
05.private static CacheItemRemovedCallback OnCacheRemove = null;
06. 
07.private void AddTask(string name, int seconds)
08.{
09.  OnCacheRemove = new CacheItemRemovedCallback(CacheItemRemoved);
10.  HttpRuntime.Cache.Insert(name, seconds, null,
11.  DateTime.Now.AddSeconds(seconds), Cache.NoSlidingExpiration,
12.  CacheItemPriority.NotRemovable, OnCacheRemove);
13.}
14. 
15.public void CacheItemRemoved(string k, object v, CacheItemRemovedReason r)
16.{
17.  // do stuff here if it matches our taskname, like WebRequest
18.  // re-add our task so it recurs
19.  DoSomeFileWritingStuff();
20.  AddTask(k, Convert.ToInt32(v));
21.}
22. 
23.private void DoSomeFileWritingStuff()
24.{
25.  clsMassMailer objMassmailer = new clsMassMailer();
26.  objMassmailer.NewMassMailTask();
27.}

col1  col2  col3  col4
----------------------
1      1a    1b    1c
1      1a    1d    1e
1      1b    1f    1g
2      2a    2b    2c
2      2a    2d    2e
2      2b    2f    2g
2      2b    2h    2i
2      2b    2j    2k

col1  col2  col3  col4
----------------------
1      1a    1b    1c
             1d    1e
       1b    1f    1g
2      2a    2b    2c
             2d    2e
       2b    2f    2g
             2h    2i
             2j    2k