public void Clear()
        {
            _memoryService.Clear();
            _memoryService.DeleteFile(Operations.FileName);
            _memoryService.DeleteFile(Conversions.FileName);
            _memoryService.DeleteFile(Categories.FileName);
            _memoryService.DeleteFile(Cash.FileName);

            Operations.Clear();
            Conversions.Clear();
            Categories.Clear();
            Cash.Clear();
        }