public List <Hobby> DeleteHobby(Hobby hobby) { DBservices db = new DBservices(); int num1 = db.GetAllHobbiesFromSQL().Count; db.DeleteHobby(hobby); List <Hobby> hobbies = db.GetAllHobbiesFromSQL(); if (hobbies.Count + 1 == num1) { return(hobbies); } else { return(null); } }