public async Task <_ListViewModel <_KeyValuePairViewModel> > Get(string filter = null)
        {
            var model = new _ListViewModel <_KeyValuePairViewModel>();

            try
            {
                model = await _context.GetRegionsAsync(filter);
            }
            catch (Exception ex)
            {
                if (model == null)
                {
                    model = new _ListViewModel <_KeyValuePairViewModel>();
                }

                if (model.Message.Length > 0)
                {
                    model.Message += " | ";
                }
                else
                {
                    model.Message = "Error: ";
                }

                model.Message += ex.Message;
            }

            return(model);
        }