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It gets the data it needs from the SQL data and runs the software-only methods on the Client.In stage 4 you see that EF Core combines the Server data and the Client data and provides the composite data back to the caller.However, a relational database will apply its own validation, such as checking that a unique index constraint hasn’t been violated, and will throw an exception if any constraint is breached.The problem with database exception messages is that they aren’t user-friendly, and can reveal something about your database structure (which is a possible security breach), so you can’t show them directly to the user.

15")] [String Length(2, Error Message = "Max 2 digits")] [Remote("Prediction OK", "Predict", Error Message = "Prediction can only be a number in range 0 .. Need to find a way how to change this error message.As you can see Authors property will be set to “Jack, Jill”, while the Book Id and Title would be set to the value of the corresponding columns in the Books Table.Stage 1, the translation of the LINQ query, is where (with the help of the database provider) EF Core splits up the LINQ commands and other methods into either “run on database” (Server) or “run in software” (Client).Any suggestions on why I need to do to get the Gridview not to update the record when the validation fails? This article is about how to catch SQL errors, like unique index violations, and turning them into user-friendly error messages.

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The code below will do this, in this case I take the first book in the database: The figure below gives you a better view of this process.

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