You can create a validator that checks for specific characters.

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 CharFormatValidator 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 for the cell.

Using Code

The following example displays an invalid backcolor if you type characters other than the format string.

FarPoint.Win.Spread.CellStyleNotify cnotify = new FarPoint.Win.Spread.CellStyleNotify();
cnotify.InvalidCellStyle.BackColor = Color.Aqua;
FarPoint.Win.Spread.CharFormatValidator cFormatValidator1 = new FarPoint.Win.Spread.CharFormatValidator();
cFormatValidator1.Format = "Ａａ";
cFormatValidator1.Actions.Add(cnotify);
fpSpread1.Sheets[0].AddValidators(new FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), cFormatValidator1);

Dim cnotify As New FarPoint.Win.Spread.CellStyleNotify()
cnotify.InvalidCellStyle.BackColor = Color.Aqua
Dim charFormatValidator1 As New FarPoint.Win.Spread.CharFormatValidator()
charFormatValidator1.Format = "Ａａ"
charFormatValidator1.Actions.Add(cnotify)
fpSpread1.Sheets(0).AddValidators(New FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), charFormatValidator1)