C#

Luc Pattyn wrote:

- make sure you don't create a lot of objects while painting controls (assuming some are user-drawn);

<br />
dtclass dt = new dtclass(value1, value2);<br />
dt.update;<br />

MyDatabase DB = new MyDatabase();//Data Context create by Linq to SQl

Car car = new Car();//Car class created by Linq to SQL
car.Make = "Ford";

DB.Cars.InsertOnSubmit(car);//add car to DB
DB.SubmitChanges();//Save DB changes

MyDatabase DB = new MyDatabase();

Car car = Db.Cars.Single(c => c.ID == 1);//get car based on ID value of 1
car.Make = "Citreon";

DB.SubmitChanges();//Save changes

class Person { ... }
class Car { ... Person Owner ... }

Person me = new Person(...) ;
Car mycar = new Car(...) ;
mycar.Owner = me ;

kruegs35 wrote:

When I think of organizing a list of people that have first names, last names, phone numbers, I think of a database table. I can store all the data in a table and query it to display what I need in a datagridview or whatever.

public enum PhoneNumberType
{
    Home,
    Mobile,
    Work
}

public class PhoneNumber
{
    private string number;
    private PhoneNumberType type;

    public PhoneNumber(string number, PhoneNumberType type)
    {
        // validate here
        this.number = number;
        this.type = type;
    }

    public string Number
    {
        get{ return number; }
    }
    public PhoneNumberType Type
    {
        get{ return type; }
    }
}

public class Person
{
    private string forename;
    private string surname;
    private List<PhoneNumber> numbers;

    public Person(string forename, string surname, IEnumerable<PhoneNumber> numbers)
    {
        // validate here
        this.forename = forename;
        this.surname = surname;
        if(numbers != null)
            this.numbers = new List<PhoneNumber>(numbers);
        else
            this.numbers = new List<PhoneNumber>();
    }

    public string Forename
    {
        get{ return forename; }
    }
    public string Surname
    {
        get{ return surname; }
    }
    public List<PhoneNumber> Numbers
    {
        get{ return numbers; }
    }
}

public class People : List<Person>
{
    // ToDo
}