C# build problem

Question

At my company I am told to get this C# 2008 application to work that has been 'stored away' for a year. The programmer who wrote the application is no longer working for this company.
  I have the following 3 references that need to resolved for ths application to work correctly:
1. I am missing a reference to the common.logging.dll.   I clicked under references and selected the .net  and com tabs. I did not find the common.logging.dll.
Is this some .net feature that I need to add to this solution file? If so, can you tell me how to locate this feature and add it to my solution file? If not, can you tell me where I can locate the common.logging.dll and how to attach the reference to my solution file?

2. My other 2 references are the names of 2 of the project files that are part of the applicable solution file. Thus I am thinking that I need to rebuild each of the two project files separately from the entire solution file to obtain the required dll files. To obtain the applicable dlls, I am thinking that I need to obtain a reference to each file in the bin/debug or bin/release folders?
 Is obtaining the applicable dlls from the bin/debug or bin/release folders a good idea or not?

Can you tell me if what I am planning to do is correct and/or what change(s) you  think I should make?