How to create vbscript object while accessing a c++ com dll?

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VBScript

COM

dim obj
set obj=CreateObject("Pro1.SimpleCom")
Dim lngReturnValue
Wscript.Echo("My number is ")
obj.add 5, 7, lngReturnValue
Wscript.Echo("My number is ")
MsgBox "The value of 5 + 7 is: " & lngReturnValue

My solution name is pro1 & class name CSimplecom ..I think i am doing the mistake in creating the vbscript object. How to do it?