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I am using the following code to validate a date in a Gridview.The error message gets displayed on an invalid date but a system error message immediately follows indicating that there was an error moving the data to a date field.Stage 2 is where the SQL commands are run on the database server and the values are read back. SELECT TOP(1) [p].[Book Id], [p].[Title] FROM [Books] AS [p] SELECT [q.Author].[Name] FROM [Book Author] AS [q] INNER JOIN [Authors] AS [q. Author].[Author Id] WHERE @_outer_Book Id = [q].[Book Id] ORDER BY [q].[Order] Stage 3 is run because EF Core detected commands that had to be run on the Client.The example I showed is simple, but the possibilities are endless. The feature is new in EF Core, and is not available in EF6.x. While I have used DD, it does require me to add a command at the end of every query. But, like all powerful features, it is best to understand what is going on so that you can use it in the right way.This means that I have to add extra stages in my query if I want to use methods such as string. Firstly, the obvious thing is the method you provide is run on every entity (row) you read from the database.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.
Typical validation rules are things like the attribute [Max Length(100)] on a string.It gets the data it needs from the SQL data and runs the software-only methods on the Client.