When you compile from Visual Studio it is obvious: in the
Bin directory.
There is however a thing called "GAC" (Global Assembly Cache) which is more for system dll's, read more about it here:
Using Assemblies in Microsoft .NET and C#[
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Normally you won't write to the GAC for your own programs and you can just copy your .dll's and .exe files in one directory for distribution.
To quote Microsoft:
Quote:
You should share assemblies by installing them into the Global Assembly Cache only when you need to
Global Assembly Cache | Microsoft Docs[
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