How to find a DLL from a using statement in Visual Studio

I am using Visual Studio 2015.

I have been given source code of a project which uses a bunch of third-party DLLs. How can I find out which using statement is using which DLL?

For example I have this statement:

using Mnp;

How can I find out that which DLL has the Mnp namespace?

I put cursor on Mnp and right-click to open right-click menu. There I tried 2 options:

Go to Definition F12
Go to Implementation Ctrl+F12

But in both cases I get the same error message:

Cannot navigate to the symbol under the caret.

I was hoping Visual Studio can point me the DLL in References section which has the namespace Mnp.

Thanks

Solution

Use the Object Browser. In the search text box put in the string of the Namespace you want to find. On the left side panel, choose the correct namespace returned. On the lower right side panel, it will say Member of (being your assembly name).