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public class FutureDate:ValidationAttribute
    {
        public override bool IsValid(object value)
        {
            var isValid=DateTime.TryParseExact(Convert.ToString(value), 
                "d MMM yyyy", 
                CultureInfo.CurrentCulture,DateTimeStyles.None,
                out DateTime dateTime);
            return (isValid && dateTime > DateTime.Now);
        }
    }
    
    
[FutureDate]
public string Date { get; set; }