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Continue to ChatASP.NET Core 3: Add Entity Framework Core to Existing Project https://elanderson.net/2019/11/asp-net-core-3-add-entity-framework-core-to-existing-project/
ASP.NET Core 3: Add Entity Framework Core to Existing Project https://elanderson.net/2019/11/asp-net-core-3-add-entity-framework-core-to-existing-project/