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Asked: 2026-05-20T14:07:01+00:00

my database field int_ParentId consist of a Null value . how would i check

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my database field int_ParentId consist of a Null value . how would i check it for a null in this linq query . it is not working 

  return _db.Categories.Where(m => m.int_ParentId==null);
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1 Answer

  1. Editorial Team

    Have you mapped you int_ParentId database field to int? type (e.g. <Column Name="int_ParentId" Type="System.Int32" DbType="Int" CanBeNull="true" />)? If yes, both:

    return _db.Categories.Where(m => m.int_ParentId == null);

    and

    return _db.Categories.Where(m => m.int_ParentId.HasValue);

    should work.

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