Formatting Excel sheet in VB.net 2008

I used to have the following code in VB 2005, but it does not work in VS 2008:

        Dim ExcelOpt As New ExcelDataOnlyFormatOptions ' this line gives an error in VS 2008

            ExcelOpt.MaintainRelativeObjectPosition = True
            ExcelOpt.ExportObjectFormatting = True
            ExcelOpt.MaintainColumnAlignment = True

Any ideas how to fix it ?

Thank you