private List<Model.article_groups> getArticleGroupInformation()
 {
     List<Model.article_groups> articleGroups = new List<Model.article_groups>();
     using (Model.MTDBEntities context = new Model.MTDBEntities())
     {
         articleGroups = context.article_groups.ToList();
     }
     return articleGroups;
 }
 private List<Model.addresses> getSupplierInformation()
 {
     List<Model.addresses> results = new List<Model.addresses>();
     List<Model.addresses> addresses = new List<Model.addresses>();
     using (Model.MTDBEntities context = new Model.MTDBEntities())
     {
         addresses = context.addresses.ToList();
         foreach (Model.addresses address in addresses)
         {
             if(address.adr_type == 6)
             {
                 results.Add(address);
             }
         }
     }
     return results;
 }
        private List<Model.inventory_positions> getInventoryPositionsInformation()
        {
            List<Model.inventory_positions> inventoryPositions = new List<Model.inventory_positions>();
            using (Model.MTDBEntities context = new Model.MTDBEntities())
            {
                inventoryPositions = context.inventory_positions.ToList();
            }
            return inventoryPositions;

        }