Usage of Attributes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;


namespace attributes
{
    [AttributeUsage(AttributeTargets.All, AllowMultiple = true)]

    public class Bugfixingattribute : Attribute
    {
        private int bugno;
        private string developer;
        private string datefixed;
        public string remarks;
        public Bugfixingattribute(int _Bugno, string _Developer, string _Datefixed)
        {
       
            this.bugno = _Bugno;
            this.developer = _Developer;
            this.datefixed = _Datefixed;
        }
        public int Bugno
        {
            get
            {
                return bugno;
            }
        }
        public string Datefixed
        {
            get
            {
                return datefixed;
            }
        }
        public string Developer
        {
            get
            {
                return developer;
            }
        }
        public string Remarks
        {
            get
            {
                return remarks;
            }
            set
            {
                remarks = value;
            }
        }
    }
        [Bugfixingattribute(125, "saralevo", "08/15/06", Remarks = "return object not specified")]
        [Bugfixingattribute(159, "saralevo", "08/17/06", Remarks = "data type mismatch")]
        public class Calculator
        {
            public double Add(Double num1, Double num2)
            {
                return num1 + num2;
            }
            public double Subtract(Double num1, Double num2)
            {
                return num1 - num2;
            }
            [Bugfixingattribute(155, "saralevo", "08/16/06")]
            public double Divide(Double num1, Double num2)
            {
                return num1 / num2;
            }
        }
        public class Entrypoint
        {
            public static void Main(string[] args)
            {
                Calculator ob = new Calculator();
                Console.WriteLine("the sum of specified two no's are:{0}", ob.Add(89.9, 20.5));
                Console.ReadLine();

            }
        }
    }