//引入命名空间
using System;
using System.Reflection;

public class Example
{
   // Mark OldProperty As Obsolete.
   [ObsoleteAttribute("This property is obsolete. Use NewProperty instead.", false)] 
   public static string OldProperty
   { get { return "The old property value."; } }
   
   public static string NewProperty
   { get { return "The new property value."; } }

   // Mark CallOldMethod As Obsolete.
   [ObsoleteAttribute("This method is obsolete. Call CallNewMethod instead.", true)] 
   public static string CallOldMethod()
   {
      return "You have called CallOldMethod.";
   }
      
   public static string CallNewMethod() 
   {   
      return "You have called CallNewMethod.";
   }   

   public static void Main()
   {                 
      Console.WriteLine(OldProperty);
      Console.WriteLine();
      Console.WriteLine(CallOldMethod());
   } 
}