save sql record in list

I have one class:

publicclass AddressBook
{publicstring FirstName
   {get;set;
   }publicstring LastName
   {get;set;
   }publicstring Address
   {get;set;
   }publicstring Phone
   {get;set;
   }public AddressBook(string firstname, string lastname, string address, string phone)
   {this.FirstName = firstname;this.LastName = lastname;this.Address = address;this.Phone = phone;
   }
}

and I have one sql database that 4 fields {first name, lastame,address,phone}. how to record data base in :

List<AddressBook> source = new List<AddressBook>();  

 ???????????