send automatic emails every day accourding to specific rule

Steps For Scheduler:-

1. Make a scheduler (window service)

//Some code

public void StartService()
       {
           Timer timer = new Timer();

           timer.Interval = 86400000; //for 24 hours

           timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);

           timer.Start();
         //  FireProcess(); 
          // SendServiceFiringMail(); Make some funtion which you want
       }

2. C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\InstallUtil.exe C:\MyService.exe

It fires 24 Hours.