Code to subscribe the User for alert notifications from a list

    1:          SPWeb web = SPContext.Current.Web;

    2:   

    3:          SPList list = web.Lists["Pages"];

    4:   

    5:          SPUser user = web.CurrentUser;

    6:   

    7:          SPAlert alert = user.Alerts.Add();

    8:   

    9:          alert.Title = "My Alert";

   10:   

   11:          alert.AlertType = SPAlertType.List;

   12:   

   13:          alert.EventType = SPEventType.All;

   14:   

   15:          alert.List = list;

   16:   

   17:          alert.AlertFrequency = SPAlertFrequency.Immediate;

   18:   

   19:          alert.AlwaysNotify = true;

   20:   

   21:          alert.Update(true); // Subscription notification will be sent to user

   22:   

   23:          //alert.Update(false); // Subscription notification will not be sent to user