Get OS/Runtime

using System;
using System.Management; //.NET
using System.Diagnostics; //Mono

class TestClass {

    public static bool IsRunningOnMono () {
        return Type.GetType ("Mono.Runtime") != null;
    }

    static int Main( string[] args ) {
        OperatingSystem os = System.Environment.OSVersion;
        Console.WriteLine("Machine: {0}", Environment.MachineName);
        Console.WriteLine("Platform: {0}", os.Platform);
        if (os.Platform == PlatformID.Unix) {
            Console.WriteLine("Total Memory: {0:N0} MB", CountPhysicalMemory());
        }
        else if (os.Platform == PlatformID.Win32NT) {
            Console.WriteLine("Total Memory: {0:N0} MB", CountPhysicalMemory());
            //this is completely redundant but keeping it anyway as
            //a reference for how PlatformID works.
        }
        else {
            Console.WriteLine("Platform: No idea what OS this is lol.");
        }
        Console.WriteLine("\nCLR Version: {0}", System.Environment.Version);
        Console.WriteLine("Thanks!");
        string o = Console.ReadLine();
        return 0;
    }


    private static UInt64 CountPhysicalMemory(){
        OperatingSystem os = System.Environment.OSVersion;
        if (!IsRunningOnMono()) {
                //.NET only
            ManagementObjectSearcher objects =
                new ManagementObjectSearcher(
                "SELECT * FROM Win32_PhysicalMemory");
            ManagementObjectCollection coll = objects.Get();
            UInt64 total = 0;
            foreach (ManagementObject obj in coll) {
                total += (UInt64)obj["Capacity"];
            }
            return total/1024/1024;
        }
        else {
            //Mono only
            var pc = new PerformanceCounter ("Mono Memory", "Total Physical Memory");
            return (UInt64)pc.RawValue/1024/1024;
        }
    }
}