This post provides an example of getting the public key token of an assembly using PowerShell.
When I need to add definitions to the web.config of my ASP.Net projects I often use this Powershell line to get the PublicKeyToken, Culture and Version etc.
([system.reflection.assembly]::loadfile("C:\AlkaneSolutions.dll")).FullName
Running this will yield a similar output to the following:
AlkaneSolutions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=aa13051522563c02