不能创建在Visual Studio防爆preSS 2012新的SQL数据表

我已经创建了我的Visual Studio前preSS 2012网站一个新的SQL数据库。这似乎在AppData文件夹。我可以在Database Explorer中打开数据库，现在我想添加一些空的数据表。

I have created a new SQL database in my Visual Studio Express 2012 website. This appears in the AppData folder. I can open the database in the Database explorer and now I want to add some empty data tables.

我右键单击表文件夹并选择添加新表。我得到的画面（如下图）。当我已经完成我点击更新，它似乎做一些事情，但随后的表没有出现在Tables文件夹。

I right click on the Tables folder and select Add New Table. I get the screen (below). When I have finished I click Update and it appears to do something but then the table has not appeared in the Tables folder.

我也试着点击保存按钮，并手动保存表AppData文件夹，但但它仍然没有出现在Tables文件夹。

I have also tried clicking the save button, and saving the table manually in the AppData folder, but yet it still does not appear in the Tables folder.

我是什么做错了吗？