fpSpread1.ShowCellErrors = true;
fpSpread1.Sheets[0].Cells[1, 1].Locked = true;
fpSpread1.Sheets[0].SetCellErrorText(1, 1, "ErrorText");
FpSpread1.ShowCellErrors = True
FpSpread1.Sheets(0).Cells(1, 1).Locked = True
FpSpread1.Sheets(0).SetCellErrorText(1, 1, "ErrorText")