If you want people to use your extension methods…

… you need to make them discoverable. That means temporarily abandoning your solution-structure-based namespaces and placing them directly in the namespace of the class you are extending so it comes up in intellisense immediately. Even if it’s from a totally different library, or System.* itself.

namespace YourCompany.Common.Extensions {    // don't expect anyone to find this here    public static class LinqExtensions { ... }}namespace System.Linq // can't miss it!{    public static class LinqExtensions { ... }}

If you’re using ReSharper you can also hit Alt+Enter and add the following so it won’t trigger code inspection warnings:

// ReSharper disable CheckNamespacenamespace System.Linq// ReSharper restore CheckNamespace{    public static class LinqExtensions { ... }}