/// <summary>
        /// Gets the products from a file an fill them into a list.
        /// Uses static class <see cref="StringCleaner"/> methods to clean for noise characters
        /// </summary>
        private void GetUsersFromFile()
        {
            IEnumerable <string[]> CleanUserInformation = _userFile.GetCellsInLinesOfFile(';')
                                                          .Select(s => StringCleaner.RemoveCharacterFromStringArray(s, '"')).Skip(1);

            _listOfUsers = RegisterUsers(CleanUserInformation);
        }
        /// <summary>
        /// Gets the products from a file and fill them into a list
        /// Uses static class <see cref="StringCleaner"/> methods to clean the information for noise characters
        /// </summary>
        private void GetProductsFromFile()
        {
            IEnumerable <string[]> _cleanProductInformation = _productFile.GetCellsInLinesOfFile(';')
                                                              .Select(s => StringCleaner.RemoveCharacterFromStringArray(s, '"'))
                                                              .Select(s => StringCleaner.RemoveHtmlTagsFromStringArray(s)).Skip(1);

            _listOfProducts = MakeProductsFromInformation(_cleanProductInformation);
        }