public class DivaFactory
{
  public delegate void FarmResultCallback(uint cookie, uint errorCode);
  private static FarmResultCallback farmCallback = new FarmResultCallback(farmResultCallbackImp);

  [DllImport(@"D:\apps\Diva\FEFarmClientShim.dll", CallingConvention = CallingConvention.StdCall)]
  public static extern void SetFarmResultListener(FarmResultCallback cb);

  public static void init()
  {
    SetFarmResultListener(farmCallback);
                feSetEnv("PLATFORM_PRIORITY", "1");
                feSetEnv("AVID_ENV_FARMS_FILE", farmConfigFilePath);
                feSetEnv("FUNCTIONREQUEST_USING_PLATFORM_SYMPHONY", "TRUE");
                feSetEnv("PLATFORM_CURL", "file://P:\\Local\\Financial Engineering External\\Farm\\Configuration\\Symphony\\Dev\\ego.conf");
                feSetEnv("PLATFORM_APPLICATION", "CreditShared");
                feSetEnv("PLATFORM_VERSION", "3.18.22");

  }

  ...
  //at some point call the feExpectedShortFall_Farm method
}

private static void farmResultCallbackImp(uint cookie, uint errorCode)
{
   ##... //never getting hit
}