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). 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. Nov 25, 2025 · This issue is surprisingly common, often stemming from subtle mismatches between your entity model, database schema, or EF Core’s handling of nullable types. In this blog, we’ll demystify `SqlNullValueException`, explore its root causes, and provide step-by-step solutions to resolve it.
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