Setwidths

I've been using itextsharp with Visual Basic and getting good results but I've been stumped on setting column widths.  Most examples seem to use some form of C and I cannot come up with a VB equivalent that works?

Can anyone suggest a VB version of the following code:

        float[] columnWidths = { 8, 13}; // percentage
        tbl.SetWidths(columnWidths);