Proto+EF model

Program.cs

using (var db = new Database()) {
  db.Fruits.Add(new Models.Fruit { Name = "Apple", Weight = 345.2 });
  var tree = new Models.Tree { Height = 45 };
  tree.Fruits.Add(new Models.Fruit { Name = "Banana", Weight = 25.1 });
  db.Trees.Add(tree);
  var count = db.SaveChanges();
  Console.WriteLine("{0} records saved to database", count);
}

using (var db = new Database()) {
  Console.WriteLine("All fruits in database:");
  foreach (var fruit in db.Fruits) {
    Console.WriteLine(" - {0}", fruit);
  }
  Console.WriteLine("garden is {0}", db.Trees.Include(t => t.Fruits).First());
}