/// <summary>
        /// Gets all items for the given <paramref name="app_form"/> bases on the given culture.
        /// <para/>If the given culture does not exist the FallBackCulture is used.
        /// </summary>
        /// <param name="app_form">A combination of the applications assembly name and
        /// <para/>the underlying form / window name.</param>
        /// <param name="ci">A culture to use for getting the form / window items.</param>
        public void RunDBCachePostgreSQL(string app_form, CultureInfo ci)
        {
            // Let's not use database connection if already cached.
            if (DBCacheHolder.ListContains(app_form, DBCache))
            {
                foreach (GuiObject go in this)
                {
                    try
                    {
                        DBCacheHolder dc = DBCache.First(first => first.PropertyName == go.PropertyName && first.Item == go.Item && first.AppForm == app_form);
                        if (dc != null)
                        {
                            if (dc.ValueType == "System.String")
                            {
                                go.Value = dc.Value;
                            }
                        }
                    }
                    catch
                    {
                        // something wrong?
                    }
                }
                return;
            }

            List <string> handled = new List <string>();

            using (NpgsqlCommand command = new NpgsqlCommand(SelectDBCache(app_form, ci), PostgreConnection))
            {
                using (NpgsqlDataReader dr = command.ExecuteReader())
                {
                    while (dr.Read())
                    {
                        string item         = dr.GetString(3);
                        string propertyName = dr.GetString(2);
                        string valueType    = dr.GetString(0);
                        string value        = dr.GetString(1);

                        foreach (GuiObject go in this)
                        {
                            if (go.PropertyName == propertyName &&
                                go.Item == item)
                            {
                                if (handled.Contains(go.PropertyName + "." + go.Item))
                                {
                                    continue;
                                }

                                try
                                {
                                    DBCache.Add(new DBCacheHolder(dr));
                                }
                                catch
                                {
                                    // Database connection error or internal logic failure? Well we can't let the application fall.
                                }

                                handled.Add(go.PropertyName + "." + go.Item);
                                if (valueType == "System.String")
                                {
                                    go.Value = value;
                                }
                            }
                        }
                    }
                }
            }
        }