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In my UI if a user selects to allow multiple , he checks the check box next to “Multiple ”. When this check box is selected, “Maximum” option becomes enabled. Here user can define how many options can be done.

I want to allow my user to do “Infinite” . The option that I have decided to use for this thing is that if user does not type anything, “-” appears in edit box showing that there is not limit and “Unlimited” is allowed. Else user can type a number or user spin control in order to specify the limit up to he is allowed.

Option can be anything either using spin control or any other thing

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Simply display "infinite" or "unlimited" instead of "-" and add a corresponding combobox value. It will be much more clear. – alexeypegov Apr 9 '14 at 7:31
unlimited is also used in most torrent downloaders when setting upload and download speed. If that's too long you have ∞ or ∞ for the infinity symbol. – Paul Apr 9 '14 at 7:43
Many developers write -1 or 0 for unlimited. But this is not user friendly. – sysscore Apr 11 '14 at 11:54
up vote 8 down vote accepted

I am wary of any solution where the user has to remember that inputting x really means y. If the "infinite" or "unlimited" state can't be unambiguously represented by the spinner control I would consider using another one specifically for the "unlimited mapping" use case. Perhaps have another checkbox for unlimited that, when selected, disables / greys out the spinner?

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