How do I solve SqlNullValueException?

Question

I\'m trying to find an entity but I get a SqlNullValueException when entity framework is trying to get the value of a field that\'s Null.

I checked in the database a

Answer 1

you have to mark all nullable CodeLists properties with Nullable data types like below:

public class CodeLists
{
    public Guid Id { get; set; }
    public Guid? ClassificationId { get; set; }
    public Guid? DescriptionId { get; set; }

    public Guid NameId { get; set; }
    public Guid? OwnerId { get; set; }

}

ClassificationId and OwnerId are not nullable in your CodeLists class implmementation but is nullable in the Db