SQL Server精简ADO.NET提供者不提供任何异步的API。但是加载数据不应该采取fewcseconds，除非你是获取行的1000。初始化dbContext.connection对象当您启动应用程序，并留下空，不使用你的应用程序的生命周期。还存在的的DbContext首次初始化的成本。

The SQL Server Compact ADO.NET provider does not provide any Async APIs. But loading data should never take a fewcseconds, unless you are fetching 1000s of rows. Initialize a dbContext.connection object when you start your app, and leave empty and unused for the lifetime of your app. There is also a cost of init of dbContext first time.