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Asked: 2026-06-04T21:24:22+00:00

I am using the ADO.NET Mocking Context Generator to generate my entity classes from

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I am using the ADO.NET Mocking Context Generator to generate my entity classes from an EDMX file, so that I can use them in unit tests. However, after I generate my entities and try to build the project, I get the following error:

The type name 'DateTime' does not exist in the type 'MyProject.Models.System'

Within the code, DateTime properties are declared in the format:

public virtual System.DateTime LastActive

If I change System.DateTime to just DateTime, the error clears. Unfortunately this is not practical, as there quite a lot of them, besides they will be overwritten next time I regenerate.

Why am i receiving this error, and how can I prevent it?

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1 Answer

  1. Editorial Team

    It looks like the problem is that you’ve got a type called System. That’s a really bad idea – it’s going to cause this problem all over the place. (See Eric Lippert’s blog posts on this topic for more details…)

    The most specific way of declaring this would be:

    public virtual global::System.DateTime LastActive { get; set; }

    If you could change the generator to create that, it should be okay… but personally I’d just change the System type to be called something else if you possibly can.

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