Custom attributes using c#

I am using data annotations to validate Model properties using MVC5 and need to validate a decimal property which should not be greater than 199.99.I am looking for sample code for custom attribute "NotGreaterThan" which should not be greater than 199.99.ie. if user enters quantity greater than 199.99, it should show message"The quantity can't be greater that 199.99".

       
[Required(ErrorMessage = "The Quantity is required")]
        [NotGreaterThan(199.99)]  //[b]custom attribute[/b]
        public decimal Quantity { get; set; }

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Thanks in advance
ksd123Asked:
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käµfm³d 👽Commented:
Untested, but you might try:

using System;
using System.ComponentModel.DataAnnotations;

namespace WebApplication6
{
    [AttributeUsage(AttributeTargets.Property)]
    public class NotGreaterThanAttribute : ValidationAttribute
    {
        private double maxValue;

        public NotGreaterThanAttribute(double maxValueInclusive)
        {
            this.maxValue = maxValueInclusive;
        }

        public override bool IsValid(object value)
        {
            return value is double && (double)value <= this.maxValue;
        }
    }
}

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louisfrCommented:
Did you try RangeAttribute?
[Range(0, 199.99)]

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ksd123Author Commented:
[NotGreaterThan(199.99)]  //error
   [NotGreaterThan(199.99m)]  //error
    public decimal Quantity { get; set; }

How can I specify decimal value for the custom attributes? I get compilation error "An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type"
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käµfm³d 👽Commented:
decimals cannot be used in this fashion. It's a limitation of the Framework. You have to use double.

e.g.

[NotGreaterThan(199.99D, ErrorMessage = "The quantity can't be greater that 199.99")]

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