The type or namespace name 'DbContext' could not be found-vs2012
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The type or namespace name 'DbContext' could not be found
The type or namespace name 'DbSet' could not be found
这个怎么处理呢？
我们在进行程序编写的时候，using System.Data.Entity; 这个已经写了，怎么还是不行？
即使在References 中已经添加了引用还是不行,
原因是要添加
EntityFramework 如果在添加了System.Data.Entity这个引用无效后；
可以使用NuGet进行处理；
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