If you are trying to Use Range Validator in ListX here is the Code.

< span
id="vCode2"
controltovalidate="frm_Code"
text="Enter number Only"
display="Dynamic"
evaluationfunction="RangeValidatorEvaluateIsValid"
type="Integer"
minimumvalue= "0"
maximumvalue=""
style="color:Red;display:none;" >Enter Numbers Only< / span >

Notice in place of errormessage we Must Use text Attribute. Setting maximumvalue="" means you setting no Maximum value.

Thank you! I went through the documentation twice before I thought of searching here. Fortunately, you had the answer.

Best regards,
- Alex.