Even shorter...

namespace FrameworkPath
{
    
using System;
    using 
System.Runtime.InteropServices;

    class 
Program
    {
        
static void Main(string[] args)
        {
            Console.WriteLine(
".NET Framework Path: {0}", RuntimeEnvironment.GetRuntimeDirectory());

            
Console.Write("Press <ENTER> to exit.");
            
Console.ReadLine();
        
}
    }
}

Stupid me...RTFM.