DDE substitute in VB .NET?

Hi,

I have a VB6 app where textboxes have DDE links to cells in an Excel spreadsheet. The Excel spreadsheet cells contain data that changes dynamically based on their formulas. The textboxes in VB have code for responding to the change events that occur due to changes in the spreadsheet cells they are dynamically linked to and this works very well. Does anyone know how I can do the same thing in VB .NET?

Thanks,

mangel