Hi,

I have a pretty basic issue when I am trying expose a C# interface for
COM interoperability. Here is the interface definition:

       [ComVisible(true)]
    public interface IClass:IClassBase
    {
        int IClassMethod();

    }

and the super interface looks like:
    public interface IClassBase
    {
        string IClassBaseMethod();

    }

The implementing class:
       [ComVisible(true)]
    public  class Class1: IClass
    {
        public int IClassMethod()
        {
            return 6;
        }
        public string IClassBaseMethod()
        {
            return "6String";
        }
       }

I build the assembly and then I add as reference using the the tlb file
for this assembly in Excel VBA. There I am trying to write code as:
Dim Iclass As Iclass
Set Iclass = New class1

MsgBox Iclass.IClassMethod       'this call is ok
Msgbox Iclass.IClassBaseMethod  'This fails.

The second call to IClassBaseMethod fails saying the method not
available on interface. I expected .NET framework to handle exposing of
super interface methods automatically. What is wrong with the above
code. How can force the base interface methods to be exposed.

Thanks in advance for taking your time to answer the question.