Attributes In C#


Attributes – Used to provide the information to compiler about the behavior of class/assemblies and this information can be used by the reflection.
Example
1.       Obsolete
2.       WebMethod
3.       Serializable
How to use Obsolete Attribute


class Program
    {
        int result = new Calculator().AddTwoNumbers(1,2);
    }
   
    public class Calculator
    {
        [Obsolete("This method is obsolete, Use new method AddNumbers(List)")]
        public int AddTwoNumbers(int num1, int num2)
        {
            return num1+num2;
        }

        //Add a method to add N numbers and it will obsolute the AddNumbers(int,int)
        public int AddNumbers(List<int> numbers)
        {
            int total = 0;
            foreach(var num in numbers)
            {
                total += num;
            }
            return total;
        }
    }

Furthermore, if you want to restrict user not to use the obsolete method you can pass the second Boolean parameter like below
[Obsolete("This method is obsolete, Use new method AddNumbers(List)",true)]

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