// Add this section to the ASPX page
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<asp:CompareValidator ID="CompareValidator1" runat="server" ErrorMessage="CompareValidator"></asp:CompareValidator>
<asp:RangeValidator ID="RangeValidator1" runat="server" ErrorMessage="RangeValidator"></asp:RangeValidator>

protected void Page_Load(object sender, System.EventArgs e)
{
if (IsPostBack) return;
FpSpread1.Sheets[0].RowCount = 10;
FpSpread1.Sheets[0].ColumnCount = 7;
// RequiredFieldValidator, from code
FarPoint.Web.Spread.TextCellType txt1 = new FarPoint.Web.Spread.TextCellType();
RequiredFieldValidator rfv = new RequiredFieldValidator();
rfv.ErrorMessage = "RequiredFieldValidator, from code: value required!";
txt1.Validators.Add(rfv);
FpSpread1.ActiveSheetView.Cells[0, 0].Text = "RequiredFieldValidator, from code";
FpSpread1.ActiveSheetView.Cells[0, 1].CellType = txt1;

// RequiredFieldValidator, from toolbox
FarPoint.Web.Spread.TextCellType txt2 = new FarPoint.Web.Spread.TextCellType();
RequiredFieldValidator1.ErrorMessage = "RequiredFieldValidator, from toolbox: value required!";
txt2.Validators.Add(RequiredFieldValidator1);
FpSpread1.ActiveSheetView.Cells[1, 0].Text = "RequiredFieldValidator, from toolbox";
FpSpread1.ActiveSheetView.Cells[1, 1].CellType = txt2;

// CompareValidator, from toolbox
FarPoint.Web.Spread.TextCellType txt3 = new FarPoint.Web.Spread.TextCellType();
CompareValidator1.ErrorMessage = "CompareValidator, from toolbox: password does not match! Enter \"Spread\"";
CompareValidator1.ValueToCompare = "Spread";
txt3.Validators.Add(CompareValidator1);
FpSpread1.ActiveSheetView.Cells[2, 0].Text = "CompareValidator, from toolbox";
FpSpread1.ActiveSheetView.Cells[2, 1].CellType = txt3;

// CompareValidator, from code
FarPoint.Web.Spread.TextCellType txt4 = new FarPoint.Web.Spread.TextCellType();
CompareValidator cv = new CompareValidator();
cv.ErrorMessage = "CompareValidator, from toolbox: password does not match! Enter \"Spread\"";
cv.ValueToCompare = "Spread";
txt4.Validators.Add(cv);
FpSpread1.ActiveSheetView.Cells[3, 0].Text = "CompareValidator, from code";
FpSpread1.ActiveSheetView.Cells[3, 1].CellType = txt4;

// RangeValidator, from toolbox
FarPoint.Web.Spread.TextCellType txt5 = new FarPoint.Web.Spread.TextCellType();
RangeValidator1.ErrorMessage = "RangeValidator, from toolbox: value should in range [10 - 15]";
RangeValidator1.MinimumValue = "10"; RangeValidator1.MaximumValue = "15";
RangeValidator1.Type = ValidationDataType.Integer;
txt5.Validators.Add(RangeValidator1);
FpSpread1.ActiveSheetView.Cells[4, 0].Text = "RangeValidator, from toolbox";
FpSpread1.ActiveSheetView.Cells[4, 1].CellType = txt5;

// RangeValidator, from code
FarPoint.Web.Spread.TextCellType txt6 = new FarPoint.Web.Spread.TextCellType();
RangeValidator rv = new RangeValidator();
rv.ErrorMessage = "RangeValidator, from toolbox: value should in range [10 - 15]";
rv.MinimumValue = "10"; rv.MaximumValue = "15";
rv.Type = ValidationDataType.Integer;
txt6.Validators.Add(rv);
FpSpread1.ActiveSheetView.Cells[5, 0].Text = "RangeValidator, from toolbox";
FpSpread1.ActiveSheetView.Cells[5, 1].CellType = txt6;
}