Delegate is a great way to implement Callback operation. But, interface is good for the implementation of Callback in different scenario which I have mentioned above. Please read carefully and understand the code snippets. I have also attached code files. Writing code is good but code with proper design approach increases the quality of code.
Windows Vista and Windows 7 make use of a c:\windows\winsxs folder to store backups of various install files and/or files replaced by updates. I'm not completely certain on everything Windows stores there.This seems to be completely separate from System Restore.he WinSxS\Backup folder: In previous versions of Windows, such as XP there was a component called 'Windows File Protection' which was used to make sure that all of the many system files were protected and backed up. These files were backed up in the %systemroot%\System32\dllcache folder.
Files that contain the .vcs file extension are usually associated with the vCalendar e-calendar and scheduling software application. This VCS file format is primarily used by the Microsoft Outlook email and scheduling application, but other scheduling software applications can use the VCS file format as well. A VCS file contains information about events and appointments that a user schedule's in the software's associated calendar. This information can then be imported into other calendar and scheduling software application, such as Microsoft Outlook, Apple iCal and a variety of Palm PDA applications.