My friend brought a ThinkPad SL500 to me. The login password are changed by somethings, that sounds some virus in there. I decided to rebuild the machine. So, I pressed F11 during the startup to enter the recovery center. Then I choose the option to recover the machine with factory setting, I got the message "Not found c:\preload\convert.cmd ". I phoned their helpdesk, I have been told that is because of recovery partition are missing. Thus, the only way to grab a recovery disk from Lenovo.

In our AdvGenCMS, we use the repository pattern in the data layer. Inside each repository, there is a LINQ datacontext. We are completely hiding the LINQ from the upper layers. In this way, we can switch to use another ORM technology in the future without other layers. We need to the repositories. That is the reason to use repository pattern

Today, a friend asked me whether that is good to upgrade from Windows 8 to 8.1. My answer is "Good,please go ahead"! Windows 8.1 is better than Windows 8. At least you will have IE 11 and a "Start" button, although that is a kind of "Windows 8". Moreover, this upgrade is free. I can't think of any reasons to stop that.

I backed to build my first iOS app again. Today, I got this error:'Cannot create an NSPersistentStoreCoordinator with a nil model'.
Actually, that is easy to fix.
Please make this line of code:

Code

Code

I found an interesting point. During few years, I meet a number of programmers in Australia and Hong Kong. The most of them have told the most productive time for them is around 9pm to midnight. The normal office hours are not very suit for them! That is interesting! What do you think about this?