Range annotation between nothing and 100?

Question

I have a [Range] annotation that looks like this:

[Range(0, 100)]
public int AvailabilityGoal { get; set; }

My webpage looks like this:

Answer 1

This seems to work as (pretty) well:

[Range(Double.NaN, 20)]
public byte? Amount { get; set; }

The lower limit is not checked upon. Not so handy if you want to check null || >= 0. Off course server-side validation goes hand-in-hand with client-side validation where this (< 0) can be checked upon.