public List <Person> GetPeople()
 {
     using (var context = new PeopleChartContext(_connectionString))
     {
         return(context.People.ToList());
     }
 }
 public void AddPeople(IEnumerable <Person> people)
 {
     using (var context = new PeopleChartContext(_connectionString))
     {
         context.People.AddRange(people);
         context.SaveChanges();
     }
 }
 public void AddPerson(Person person)
 {
     using (var context = new PeopleChartContext(_connectionString))
     {
         context.People.Add(person);
         context.SaveChanges();
     }
 }