Listing 4-11 extracted from chapter The CLR (Common Languages Runtime)

Listing 4-10<     > Listing 4-12

This listing can be compiled with the command line:
csc.exe /out:AsmLibrary.dll /target:library Example_4_11_to_rename_AsmLibrary.cs
Errors: 0 Warnings: 0

using System;
namespace MyTypes {
   public class FooClass {
      public static int Sum( int a, int b ) { return a + b; }
   }
}