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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T11:10:05+00:00 2026-05-28T11:10:05+00:00

I have 2 generic lists. List 1 is populated with products from a database

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I have 2 generic lists.

List 1 is populated with products from a database and List 2 is populated with products from a webservice.

I am wanting to compare lists and any values that are not in List 2 add them to List 3.

I have tried

List<ProductModel> productsToAdd = productsInDatabase.Except(productsFromService).ToList();

However all results are displayed even tho product already is in the database.

What am I doing wrong? do I need to somehow use Except but use an Id field?

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  1. Editorial Team
    Editorial Team
    2026-05-28T11:10:06+00:00Added an answer on May 28, 2026 at 11:10 am

    Use overloaded version of Except method and pass equality comparer: MSDN

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