public static void uppdateActivity(int id, string desc, int numOfStudents, int numberOfSupervisor)
{
// make a new variable of type SomerenModel.Activities in order to store data to it
SomerenModel.Activities newActivity = new SomerenModel.Activities();
// store data to the newActivity variable
newActivity.setId(id);
newActivity.setActivity_desc(desc);
newActivity.setNumOfStudents(numOfStudents);
newActivity.setNumOfSupervisors(numberOfSupervisor);
// passing data to the DB layer
SomerenDB.DB_uppdateActivity(newActivity);
}