Public Function IsCellInView( _
   ByVal rowViewportIndex As Integer, _
   ByVal columnViewportIndex As Integer, _
   ByVal cellRowIndex As Integer, _
   ByVal cellColumnIndex As Integer _
) As Boolean

Dim instance As FpSpread
Dim rowViewportIndex As Integer
Dim columnViewportIndex As Integer
Dim cellRowIndex As Integer
Dim cellColumnIndex As Integer
Dim value As Boolean
 
value = instance.IsCellInView(rowViewportIndex, columnViewportIndex, cellRowIndex, cellColumnIndex)

public bool IsCellInView( 
   int rowViewportIndex,
   int columnViewportIndex,
   int cellRowIndex,
   int cellColumnIndex
)

bool b;
b = fpSpread1.IsCellInView(0, 0, 20, 4);
if (!b) 
{
      fpSpread1.ShowCell(0, 0, 20, 4, FarPoint.Win.Spread.VerticalPosition.Center, FarPoint.Win.Spread.HorizontalPosition.Center);
}