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There are a few different ways to get the local IP address. Here’s a good article on three different methods.

Both System.Environment.UserName and System.Security.Principal.WindowsIdentity.GetCurrent().Name return a Windows username.

What’s the difference, other than the fact that the second version returns the “full” version (domain\username)?

From the documentation:

System.Environment.UserName “gets the user name of the person who started the current thread.”

System.Security.Principal.WindowsIdentity.GetCurrent() “returns a WindowsIdentity object that represents the current Windows user.”