Web Reference: Apr 28, 2019 · The error message indicates that EF Core is trying to read string value for a required property, i.e. a property which should never have null value in the database, but instead the underlying data reader reports null value for that property in some record (s). The exception that is thrown when the Value property of a System.Data.SqlTypes structure is set to null. Jan 16, 2026 · In this blog, we’ll demystify `SqlNullValueException`, explore its common causes, walk through step-by-step troubleshooting, and provide actionable fixes. By the end, you’ll be equipped to diagnose and resolve this issue quickly in your ASP.NET Core projects.
YouTube Excerpt: Solution: Questionmark ? behind Type like string? or DateTime?
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