red-agent@linuxbox ~ $ csharp 
Mono C# Shell, type "help;" for help

Enter statements below.
csharp> LoadAssembly ("System.Core");                                                                               
csharp> using System.Collections.Generic;                                                                           
csharp> using System.Linq;                                                                                          
csharp> List <string> list = new List <string> { "aaa", "bbb", "ccc", "ddd", "eee", "fff" };                        
csharp> Time (() => { list.ConvertAll (delegate (string x) { return x.ToUpper (); }); });
00:00:00.0078950
csharp> Time (() => { list.Select (x => x.ToUpper ()).ToList (); });                      
00:00:00.0054500