The default providers use data Annotations, a validation and metadata approach introduced in Preview 1.
默认的提供者使用了数据标记，这是在Preview1中引入的验证和元数据表现方式。
Preview 2 builds on the features of Preview 1, adding client-side validation, streamlined support of Areas, and abstractions of data Annotations validation and metadata providers.
Preview2在之前的基础上增加了客户端验证，精简的Are a支持，以及抽象的数据标记(Data Annotations)验证和元数据提供者等功能。
Preview 2 builds on the features of Preview 1, adding client-side validation, streamlined support of Areas, and abstractions of data Annotations validation and metadata providers.
Preview2在之前的基础上增加了客户端验证，精简的Are a支持，以及抽象的数据标记(Data Annotations)验证和元数据提供者等功能。
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