TXTextControl.Windows.Forms.Ribbon.RibbonTextBox.InputValidationMode Enumeration

Determines the validation mode that is used to validate the inserted text in the RibbonTextBox:

Member Description
All All characters are valid to be inserted into the text box.
LettersOrDigits Only letters or digits are valid text box characters.
OnlyLetters Only letters or digits are valid text box characters.
OnlyDigits Only digits are valid text box characters.