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User user;
ArrayList list = new ArrayList();
for (int i = 0; i< 100;i++)
{
  user = new User(x,y,z);
  list.add(user);
}					

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  User user;
            Markt markt;
            ArrayList list = new ArrayList();
                    
            marktgebuehr_update markt_u = new marktgebuehr_update();
XmlElement root = GetResponseDom(markt_u.getKatalog(methode));

                
                foreach (XmlNode @data in root[methode].ChildNodes)
                {
                    if (methode.Equals("benutzer"))
                    {
                        user = new User(@data["loginname"].InnerText, @data["pwd_md5"].InnerText, Convert.ToInt32(@data["id"].InnerText));
                        MessageBox.Show(user.uLoginName.ToString());
                        list.Add(user);
                    }
                    else
                    {
                        markt = new Markt(Convert.ToInt32(@data["id"].InnerText), @data["name"].InnerText, Convert.ToDouble(@data["preis"].InnerText));
                        list.Add(markt);
                    }
                    
                }					

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class User
    {
        private string loginName, pw;
        private int id;

        public User(string loginName, string pw, int id)
        {
            this.id = id; //hier schon
            this.pw = pw;
            this.loginName = loginName;
        }


        public int uID
        {
            get
            {
                return this.id;
            }
            set
            {
                this.id = value;
            }
          
        }

        public string uLoginName
        {
            get
            {
                return this.uLoginName;
            }
            set
            {
                this.uLoginName = value;
            }
          
        }

        public string upw
        {
            get
            {
                return this.pw;
            }
            set
            {
                this.pw = value;
            }
           
        }

    }					

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User user1 = new User("test","test2",1);
MessageBox.Show(user1.uLoginName.toString());