c# - Why this range attribute in mvc does not give me right answer.? -

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i'm trying apply range attribute on class field this.

 [range(typeof(int32), "1","999", errormessage = "must number between 1  , 999")]   public long? fieldname{ get; set; }

but doesn't validate range expecting. supposed validate range between 1 , 999. how resolve issue.

try this..........

[range(typeof(int32), "1", "999", errormessage = "must positive natural number between 1 , 999")] [regularexpression("^[0-9]{1,3}$", errormessage = "must positive natural number between 1 , 999")] public long? fieldname { get; set; }


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