Public Overloads Sub SetViewportPreferredWidth( _
   ByVal columnViewportIndex As Integer, _
   ByVal value As Integer _
) 

Dim instance As SpreadView
Dim columnViewportIndex As Integer
Dim value As Integer
 
instance.SetViewportPreferredWidth(columnViewportIndex, value)

public void SetViewportPreferredWidth( 
   int columnViewportIndex,
   int value
)

FarPoint.Win.Spread.SpreadView sv = fpSpread1.GetRootWorkbook();
sv.AddViewport(0, 0);
sv.SetViewportPreferredWidth(0, 80);
MessageBox.Show("The preferred width of the viewport is " + sv.GetViewportPreferredWidth(0, 0).ToString());

Dim sv As FarPoint.Win.Spread.SpreadView = FpSpread1.GetRootWorkbook
sv.AddViewport(0, 0)
sv.SetViewportPreferredWidth(0, 80)
MessageBox.Show("The preferred width of the viewport is " & sv.GetViewportPreferredWidth(0, 0).ToString())