How do I find the PublicKeyToken for a particular dll?

Question

I need to recreate a provider in my web.config file that looks something like this:

Answer 1

Assembly.LoadFile(@"C:\Windows\Microsoft.NET\Framework\v4.0.30319\system.data.dll").FullName

Will result in

System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089