If we want to copy from project folder DLL (3rd party or other type) to Bin folder during build the solution we can easily map that option.
right click on you solution -> Properties -> Buld Events and follow the format for your folder
C:\Windows\System32\xcopy /d /y "$(ProjectDir)PackagedDLL\FAX\*.*" "$(TargetDir)"
In my case FAX is my folder name.