public ContactEditViewModel(string id)
        {
            id2 = id;
            Proxy proxy = new Proxy();
             ContactsList result = proxy.SearchID(id);
                foreach (var obj in result.contact)
                {
                    FirstName = obj.Vorname;
                    LastName = obj.Nachname;
                    Titel = obj.Titel;
                    Suffix = obj.Suffix;
                    string birth2 = obj.Geburtsdatum;
                    Adresse = obj.Adresse;
                    Deliveryaddress = obj.Lieferadresse;
                    Billingaddress = obj.Rechnungsadresse;
                    id = obj.Id;

                    string[] birth = Regex.Split(birth2, "T");
                    Birthday = birth[0];

                }
        }