csharp 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[ObsoleteAttribute("Here you say why this class is obsolete", false)]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   [ObsoleteAttribute("Here you say why this property is obsolete", false)]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 {}
   }
}