How to mark a class as Obsolete or Deprecated in C# ?

Published on January 6, 2014 by Senthil Kumar

Filed under C#

Last modified January 7, 2014

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Sometimes , you may want to mark a class or method as deprecated so that the you dont want to use the class any more and also want to let know , other developers that the class is obsolete .

You can do that by using the Obsolete attribute as shown below . The Obsolete attribute also includes 2nd parameter (boolean) . When this valus is false , only a warning is shown when building the project . When this valus is true , it shows an compiler error.

How to mark a class as Obsolete or Deprecated in C# ?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AbundantcodeConsole

    class Program
        static void Main(string[] args)
            Employee emp = new Employee();

            Console.WriteLine("Welcome to");
    [Obsolete("This class is deprecated", true)]
    public class Employee
        public string Name { get; set; }

How to mark a class as Obsolete or Deprecated in C# ?

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