You can create a validator that requires a valid type. The required type validator supports DateTime, TimeSpan, and Decimal (Numeric).

A validation error occurs if the value is not valid. You can also create an action, such as adding a backcolor to the cell, that lets the user know the value is invalid.

Use the RequiredTypeValidator class to create the validator. Specify a notification type such as CellStyleNotify. Then use the AddValidators method to add the validator to a cell range.

The following image displays an invalid backcolor in the cell.

Using Code

The following example displays the invalid color if the value is not decimal or null.

//Type a text string in cell 1,1 to see the error notification
FarPoint.Win.Spread.CellStyleNotify cnotify = new FarPoint.Win.Spread.CellStyleNotify();
cnotify.InvalidCellStyle.BackColor = Color.Aqua;
FarPoint.Win.Spread.RequiredTypeValidator requiredt = new FarPoint.Win.Spread.RequiredTypeValidator();
requiredt.RequiredType = typeof(decimal);
requiredt.NullIsValid = true;
requiredt.Actions.Add(cnotify);
fpSpread1.Sheets[0].AddValidators(new FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), requiredt);
fpSpread1.Sheets[0].Cells[1, 1].Value = 5;

'Type a text string in cell 1,1 to see the error notification
Dim cnotify As New FarPoint.Win.Spread.CellStyleNotify()
cnotify.InvalidCellStyle.BackColor = Color.Aqua
Dim requiredt As New FarPoint.Win.Spread.RequiredTypeValidator()
requiredt.RequiredType = GetType(Decimal)
requiredt.NullIsValid = True
requiredt.Actions.Add(cnotify)
fpSpread1.Sheets(0).AddValidators(New FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), requiredt)
fpSpread1.Sheets(0).Cells(1, 1).Value = 5