Public Function GetRowIndex( _
   ByVal pageIndex As Integer, _
   ByVal row As Integer _
) As Integer

Dim instance As FpSpread
Dim pageIndex As Integer
Dim row As Integer
Dim value As Integer
 
value = instance.GetRowIndex(pageIndex, row)

public int GetRowIndex( 
   int pageIndex,
   int row
)

FpSpread1.Sheets[0].RowCount = 30;
ListBox1.Items.Add(FpSpread1.GetColumnIndex(1).ToString());
ListBox1.Items.Add(FpSpread1.GetRowIndex(1, 1).ToString());
ListBox1.Items.Add(FpSpread1.GetPageIndex(11).ToString());

FpSpread1.Sheets(0).RowCount = 30
ListBox1.Items.Add(FpSpread1.GetColumnIndex(1).ToString())
ListBox1.Items.Add(FpSpread1.GetRowIndex(1, 1).ToString())
ListBox1.Items.Add(FpSpread1.GetPageIndex(11).ToString())