Even after adding the "System.Linq" reference in the .NET Code Execute window (Language is C#), it does not seem to allow C# code like:
myArray.Select( x => x.Name);
Note: we added the System.Linq.dll as well, didn't seem to make a difference.

Not sure why this is. Is the engine under the hood out of date? It's strange given that all .NET projects reference "using System.Linq" and have been doing so for 6 years.