Listing 8-14 extracted from chapter Interoperability between .NET and native code/COM/ COM+

Listing 8-13<     > Listing 8-15

This listing can be compiled with the command line:
csc.exe /out:dotNET2COM.dll /target:library Example_8_14_to_rename_dotNET2COM.cs
Errors: 0 Warnings: 0

namespace Test {
   public interface ICalc {
      int CalcSum(int a, int b);
   }
   public class CCalc : ICalc {
      public int CalcSum(int a, int b) {
         return a + b;
      }
   }
}