public Trein GetTreinbyId(long id)
        {
            string sql = "Select * from Trein where id=@id";
            List <KeyValuePair <string, string> > parameters = new List <KeyValuePair <string, string> >
            {
                new KeyValuePair <string, string>("id", id.ToString())
            };

            DataSet results = ExecuteSql(sql, parameters);
            Trein   p       = null;

            if (results != null && results.Tables[0].Rows.Count > 0)
            {
                p = DataSetParser.DataSetToTrein(results, 0);
            }
            return(p);
        }
        public List <Trein> GetAllTreinen()
        {
            string sql = "Select * from Trein ";
            List <KeyValuePair <string, string> > parameters = new List <KeyValuePair <string, string> >();
            DataSet results = ExecuteSql(sql, parameters);

            List <Trein> treinen = new List <Trein>();

            if (results != null)
            {
                for (int x = 0; x < results.Tables[0].Rows.Count; x++)
                {
                    Trein p = DataSetParser.DataSetToTrein(results, x);
                    treinen.Add(p);
                }
            }
            return(treinen);
        }