static void Main(string[] args)
{
Postcode postal = new Postcode(1, 2620, "Hemiksem");
DataAcces da = new DataAcces("postal");
List<object> pcs = new List<object>();
pcs.Add(postal);
pcs.Add(postal);
pcs.Add(postal);
da.AddAll(pcs);
Console.Read();
}