Deleting events from Calendar not being deleted

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http://stackoverflow.com – I am trying to make my App add reminders to the user's Calendar. The code searches for the title and start date to check if the event already exists in the Calendar before adding it (so as not to have duplicates). My problem is that: if I remove the event from the Calendar manually (using the Calendar), the event disappears from the Calendar (I am viewing all my Calendars and can't see it in the Calendar Application) but not from the DataBase. Another thing I don't understand is that I tried to remove the events programmatically, but still they are not removed. Here is my code snippet: C (HowTos)