gistfile1.txt

        private static IEnumerable<Type> GetTypesInDirectoryWithExtension(string path, string extension)
        {
            foreach (FileInfo file in new DirectoryInfo(path).GetFiles(extension, SearchOption.AllDirectories))
            {
              Type[] types = null;
              try
              {
                Assembly a = Assembly.LoadFrom(file.FullName);

                types = a.GetTypes();
              }
              catch (ReflectionTypeLoadException err)
              {
                // Suggest cleaning bin directory
                foreach (var loaderException in err.LoaderExceptions)
                {
                  // log loaderException
                }

                throw;
              }

              foreach (Type t in types)
                  yield return t;
            }
        }