Where should I store referenced DLL binaries in my visual studio solution

When writing programs (C#.NET) I'll commonly use external libraries I've downloaded from various websites such as custom WinForm controls, or other libraries. Even if the source is available I usually prefer to reference the compiled DLL files rather then create another whole project in my solution for the 3rd party library or co开发者_JS百科ntrol.

So my question is where would people typically store external DLLs like this in the solution? The referencing project folder? The solution folder? Another folder?

I always create a lib folder at the same level of the src folder and put all external DLLs there. They are referenced through a relative path.