CSHARP

c# obsolete class

//The last parameter (true|false) determine if the use of class, property,
//function, etc is considered as error or not

[ObsoleteAttribute("Here you say why this class is obsolete", false)]
public class MyClass
{
   [ObsoleteAttribute("Here you say why this property is obsolete", false)]
   public string MyProperty
   {
       get {}
       set {}
   }
}

c# obsolete class

[Obsolete("Not used any more", true)]
public class MyDeprecatedClass
{
    //...
}