Classes vs. Modules in VB.NET

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Modules are VB counterparts to C# static classes. When your class is designed solely for helper functions and extension methods and you don’t want to allow inheritance and instantiation, you use a Module.

By the way, using Module is not really subjective and it’s not deprecated. Indeed you must use a Module when it’s appropriate. .NET Framework itself does it many times (System.Linq.Enumerable, for instance). To declare an extension method, it’s required to use Modules.

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