static void Main(string[] args)
{
IMyClass a = null;
Guid guid = new Guid("61D7B4BA-1597-4AAA-93D9-582412D2A04F");
Type transactionType = Type.GetTypeFromCLSID(guid);
object transaction = Activator.CreateInstance(transactionType);
a = transaction as IMyClass;
int b = a.Add(2, 3);
Console.WriteLine(b);
Console.ReadKey();
}
static void Main(string[] args)
{
IMyClass myClass = CreateMyClass();
Console.WriteLine(myClass.Add(3, 4));
}