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Home/ Questions/Q 6132609
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T17:07:22+00:00 2026-05-23T17:07:22+00:00

Why sometimes List collections doesn’t support OrderBy or ToList() or other methods and Intellisence

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Why sometimes List collections doesn’t support OrderBy or ToList() or other methods and Intellisence wouldn’t even show them?

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  1. Editorial Team
    Editorial Team
    2026-05-23T17:07:23+00:00Added an answer on May 23, 2026 at 5:07 pm

    Any type that implements the IEnumerable<T> interface can be used with the LINQ extension methods: OrderBy, ToList etc. List<T> implements IEnumerable<T>, and so does almost every other generic collection that you’re likely to encounter.

    However, because LINQ is primarily implemented using extension methods, you’ll need to include a using System.Linq directive at the top of your code file. If you don’t have using System.Linq then the LINQ extensions aren’t going to appear in intellisense etc.

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