ShowError Property

True if the data validation error message will be displayed whenever the user enters invalid data. Read/write Boolean.

Example

This example adds data validation to cell A10 on worksheet one. The input value must be from 5 through 10; if the user types invalid data, an error message is displayed but no input message is displayed.

With Worksheets(1).Range("A10").Validation
    .Add Type:=xlValidateWholeNumber, _
        AlertStyle:=xlValidAlertStop, _
        Operator:=xlBetween, Formula1:="5", _
        Formula2:="10"
    .ErrorMessage = "value must be between 5 and 10"
    .ShowInput = False
    .ShowError = True
End With