Hello OMER,
If you would like to allow values that are not valid in order to notify the end user, then I will suggest you set min and max values to null (default values) and leave the validation on the validation framework you are using. Thus the user will be able to enter "300", which is valid number but "out of range". In this case the validation will trigger and will notify the end user that the value is not correct.
Regards,
Georgi Krustev
Telerik
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