Public Sub AddColumnHeaderSpanCell( _
   ByVal row As Integer, _
   ByVal column As Integer, _
   ByVal rowCount As Integer, _
   ByVal columnCount As Integer _
) 

Dim instance As SheetView
Dim row As Integer
Dim column As Integer
Dim rowCount As Integer
Dim columnCount As Integer
 
instance.AddColumnHeaderSpanCell(row, column, rowCount, columnCount)

public void AddColumnHeaderSpanCell( 
   int row,
   int column,
   int rowCount,
   int columnCount
)

FarPoint.Win.Spread.SheetView sv;
fpSpread1.ActiveSheet.ColumnHeader.RowCount = 4;
sv = fpSpread1.ActiveSheet;
sv.AddColumnHeaderSpanCell(0, 0, 2, 2);

Dim sv As FarPoint.Win.Spread.SheetView
FpSpread1.ActiveSheet.ColumnHeader.RowCount = 4
sv = FpSpread1.ActiveSheet
sv.AddColumnHeaderSpanCell(0, 0, 2, 2)