Columns objects returned by Columns.Default, ColumnHeader.Columns, and RowHeader.Columns do not have formulas.
FarPoint.Win.Spread.Column col;
col = fpSpread1.ActiveSheet.Columns[0];
fpSpread1.ActiveSheet.Cells[2, 3].Value = 10;
fpSpread1.ActiveSheet.Cells[2, 2].Value = 10;
col.Formula = "SUM(C2, D2)";
Dim col As FarPoint.Win.Spread.Column col = fpSpread1.ActiveSheet.Columns(0) fpSpread1.ActiveSheet.Cells(2, 3).Value = 10 fpSpread1.ActiveSheet.Cells(2, 2).Value = 10 col.Formula = "SUM(C2, D2)"