如何在实体框架5中重命名数据库列，代码第一次迁移而不丢失数据?

I got the default ASP.NET MVC 4 template successfully running with EF 5.0 Code First Migrations. However, when I update a model property name, the corresponding table column data is dropped by EF 5.0.I got the default ASP.NET MVC 4 template succes