using System;

public class Program

{

    public static void Main()

    {

        int x = Program.MethodName(400);

        Console.WriteLine(x);

    }

    [AttributeValidator (nameof(param))]

    static int MethodName (int param) 

    {

        Validator.ValidateMethodParameter(param, nameof(param));

        return param;

    }

}

​

[AttributeUsage(AttributeTargets.Method, Inherited = true)]

public class AttributeValidator : Attribute

{

    public string ParameterName { get; private set; }

​

    public AttributeValidator(string parameterName)

    {

        ParameterName = parameterName;

    }

}

​

public class ParameterValidationException : Exception

{

    public ParameterValidationException(string message) : base(message) { }

}

​

public class Validator

{

    public static void ValidateMethodParameter(int paramValue, string paramName)

    {

        if (paramValue < 0 || paramValue > 400)

        {

            throw new ParameterValidationException($"Parameter {paramName} is out of range. Must be between 0 and 400.");

        }

    }

}