I need to validate minimum price that can be included when saving. how do i create a extender validation for this using CMSValidator
You could take a look at
The module includes rules for numeric validations.
$rule_Persons_Max = new NetefxValidatorRuleSMALLEREQUAL ("Persons", "Our flats are suitable for at most six persons", 'error', '6');
I didnt test it with the final 3.1 release. But i would expect that it runs without problems.
So if you are using 3.1 please let me know if the module has problems with 3.1
The documentation is available here: http://netefx.de/Silverstripe-NetefxValidator.php