次のサンプルコードは、ErrorMessageプロパティを設定します。
FarPoint.Web.Spread.TextCellType textcell = new FarPoint.Web.Spread.TextCellType();
textcell.ErrorMessage = "Error";
FpSpread1.ActiveSheetView.Cells[0, 0].CellType = textcell;
Dim textcell As New FarPoint.Web.Spread.TextCellType()
textcell.ErrorMessage = "Error"
FpSpread1.ActiveSheetView.Cells(0, 0).CellType = textcell