Execute machine code in C#

MachineCodeSharp.cs

using System;
using System.Runtime.InteropServices;

namespace AssemblySharp
{
    class Program
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, AllocationType flAllocationType, MemoryProtection flProtect);

        [Flags]
        public enum AllocationType
        {
            Commit = 0x1000,
            Reserve = 0x2000,
            Decommit = 0x4000,
            Release = 0x8000,
            Reset = 0x80000,
            Physical = 0x400000,
            TopDown = 0x100000,
            WriteWatch = 0x200000,
            LargePages = 0x20000000
        }

        [Flags]
        public enum MemoryProtection
        {
            Execute = 0x10,
            ExecuteRead = 0x20,
            ExecuteReadWrite = 0x40,
            ExecuteWriteCopy = 0x80,
            NoAccess = 0x01,
            ReadOnly = 0x02,
            ReadWrite = 0x04,
            WriteCopy = 0x08,
            GuardModifierflag = 0x100,
            NoCacheModifierflag = 0x200,
            WriteCombineModifierflag = 0x400
        }
        const int 
            PAGE_READWRITE = 0x40,
            PROCESS_VM_OPERATION = 0x0008,
            PROCESS_VM_READ = 0x0010,
            PROCESS_VM_WRITE = 0x0020;

        const uint PAGE_EXECUTE_READWRITE = 0x40;

        delegate int IntDelegate();

        static void Main(string[] args)
        {
            byte[] code = { 0xb8, 0x01, 0x00, 0x00, 0x00, 0xc3 };
            var buffer = VirtualAlloc(IntPtr.Zero, (uint)code.Length, AllocationType.Commit, MemoryProtection.ExecuteReadWrite);
            Marshal.Copy(code, 0, buffer, code.Length);
            var ptr = Marshal.GetDelegateForFunctionPointer<IntDelegate>(buffer);
            Console.WriteLine(ptr());
            Console.Read();
        }
    }
}