在没有TimeStamp和StoredProcedures的情况下同时使用Linq SubmitChanges

I am using Sql tables without rowversion or timestamp. However, I need to use Linq to update certain values in the table. Since Linq cannot know which values to update, I am using a second DataContext to retrieve the current object from database and use both the database and the actual object as Input for the Attach method like so:I am using Sql tables without rowversion or tim