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        public string StandartDrucker { get; set; }					

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        public List<string> MeineListe { get; set; }					

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public class MeineLiebeKlasse
{
    public MeineLiebeKlasse()
    {
        MeineLiebeProperty = new List<string>();
    }

    public List<string> MeineLiebeProperty { get; private set; }
}					

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Recycle.Logics
{
    public class Customer
    {
        public long Id { get; set; }
        public long CustomerId { get; set; }
        public string CompanyName { get; set; }
        public string InvoiceName { get; set; }
        public string Charge { get; set; }
        public string Street { get; set; }
        public string Postale { get; set; }
        public string City { get; set; }
        public int ChargeBegin { get; set; }
        public int ChargeEnd { get; set; }
        public int Active { get; set; }
        public string DocumentPath { get; set; }
        public int HasUnit { get; set; }
        public int HasTp { get; set; }
     }
}					

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        private void KundeNeuUserControl_Load(object sender, EventArgs e)
        {
            bsCustomer.DataSource = new Customer();
            txtCompanyName.Select();

            cmbTP.Items.Add("Nein");
            cmbTP.Items.Add("Ja");
            cmbUnit.Items.Add("Nein");
            cmbUnit.Items.Add("Ja");

            cmbDocument.DataSource = CustomerMethods.GetAllForms();
            cmbDocument.DisplayMember = "name";
            cmbDocument.ValueMember = "vorlagengrundid";
            cmbDocument.SelectedIndex = -1;

            lblChargeBegin.Text = CustomerMethods.GetChargeBegin().ToString();
            lblChargeEnd.Text = Convert.ToString(Convert.ToInt16(lblChargeBegin.Text) + 24);
        }					

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        private bool hasUnit;
        public bool HasUnit
        {
            get
            {
                return hasUnit;
            }
            set
            {
                hasUnit = value;
            }
        }					

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    public class CustomerContact
    {
        public CustomerContact(string authority, string title, string name, string email, string number, string mobil, string fax)
        {
            this.Authority = authority;
            this.Name = title + " " + name;
            this.Email = email;
            this.Number = number;
            this.Mobil = mobil;
            this.Fax = fax;
        }

        public string Authority { get; set; }
        public string Name { get; set; }
        public string Email { get; set; }
        public string Number { get; set; }
        public string Mobil { get; set; }
        public string Fax { get; set; }
    }					

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        public List<CustomerContact> ListCostumerContact { get; set; }					

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        private void btnContactErfassen_Click(object sender, EventArgs e)
        {
            listCostumerContactBindingSource.Add(new CustomerContact(txtZustaendig.Text, cmbAnrede.Text, txtAnsprech.Text, txtEmail.Text, txtFestNetz.Text, txtMobil.Text, txtFax.Text));
            //newCustomer.ListCostumerContact.Add(new CustomerContact(txtZustaendig.Text, cmbAnrede.Text, txtAnsprech.Text, txtEmail.Text, txtFestNetz.Text, txtMobil.Text, txtFax.Text));
        }					

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private bool hasUnit;
public bool HasUnit
{
    get
    {
        return hasUnit;
    }
    set
    {
        hasUnit = value;
    }
}
public Int32 HasUnitAsInt32
{
    get
    {
        return hasUnit ? 1 : 0;
    }
    set
    {
        hasUnit = value == 1;
    }
}					

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namespace Recycle.Controls
{
    public partial class KundeNeuUserControl : UserControl
    {
        long employee = 0;
        Customer newCostumer = new Customer();

        public KundeNeuUserControl(long uebergabe)
        {
            InitializeComponent();
            employee = uebergabe;
        }

        private void KundeNeuUserControl_Load(object sender, EventArgs e)
        {
            bsCustomer.DataSource = newCostumer;
            txtCompanyName.Select();

...					

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        public List<CustomerContact> ListCostumerContact { get; private set; }

        public Customer()
        {
            ListCostumerContact = new List<CustomerContact>();
        }					

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                newCostumer.ListCostumerContact.Add(new CustomerContact(txtZustaendig.Text, cmbAnrede.Text, txtAnsprech.Text, txtEmail.Text, txtFestNetz.Text, txtMobil.Text, txtFax.Text));					

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foreach (string eintrag in ListCostumerContact) 
  {
      Console.WriteLine(eintrag);
  }