This property presents you with the opportunity to enter a programming language specific condition that will be used to determine the validity of the submitted value. If the requirement is not satisfied the error message from Validation Text property is shown.
Important: If there is no text entered into the Validation Text property the message is not shown and the following warning message appears in the Messages Window: "Warning: TextBox DateFiled: The Validation Text property is empty."
The property value depends on the programming language of the project.
FieldName.Value > Date()