60848.cs

using System;

public static class Program
{
    public const string UnicodeLowSurrogate = "l\uDC00";
    public const string UnicodeHighSurrogate = "h\uD800";
    public const string UnicodeReplacementCharacter = "\uFFFD";

    public static void Main()
    {
        Console.WriteLine("Entry");
        var types = new [] {
            typeof (A),
            typeof (B),
            typeof (C)
        };
        Console.WriteLine("Array created");

        foreach (var t in types) {
            Console.WriteLine("Get attribute of {0}", t);
            var a = ((ObsoleteAttribute)t.GetCustomAttributes(true)[0]);
            var m = a.Message;
            Console.WriteLine("Enumerate characters of {0}", m);
            foreach (var ch in m)
                Console.Write("{0:X2}", (uint)ch);
            Console.WriteLine();
        }

        Console.WriteLine("Done");
    }
}

[Obsolete(Program.UnicodeHighSurrogate)]
public class A {
}

[Obsolete(Program.UnicodeLowSurrogate)]
public class B {
}

[Obsolete(Program.UnicodeLowSurrogate + Program.UnicodeHighSurrogate)]
public class C {
}