Reflection C#

using System;
using System.Reflection;
class ADGetData 
{
    public static void Main() 
    {
        AppDomain currentDomain = AppDomain.CurrentDomain;
        currentDomain.SetData("MyKey", "Example value");
        Console.WriteLine("MyKey is: " + currentDomain.GetData("MyKey"));
        Console.WriteLine(currentDomain.GetData("LOADER_OPTIMIZATION"));
    }
}