Public Overridable Property ExtensionData As ExtensionDataObject

Dim instance As StorageOptions
Dim value As ExtensionDataObject
 
instance.ExtensionData = value
 
value = instance.ExtensionData

public virtual ExtensionDataObject ExtensionData {get; set;}

public:
virtual property ExtensionDataObject ExtensionData {
   ExtensionDataObject get();
   void set (ExtensionDataObject value);
}