Thread: /Gm' and '/clr' command-line options are incompatible

cl : Command line error D2016 : '/Gm' and '/clr' command-line options are incompatible

That is the error I get when I compile my program. The code is this(get it from msdn to test):

Code:

#include "stdafx.h"
#using <mscorlib.dll>
#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Net;
using namespace System::Net::Sockets;
using namespace System::Text;

void main() {    
    try {
        // Set the TcpListener on port 13000.
        Int32 port = 13000;
        IPAddress* localAddr = IPAddress::Parse(S"127.0.0.1");

        // TcpListener* server = new TcpListener(port);
        TcpListener* server = new TcpListener(localAddr, port);

        // Start listening for client requests.
        server->Start();

        // Buffer for reading data
        Byte bytes[] = new Byte[256];
        String* data = 0;

        // Enter the listening loop.
        while (true) {
            Console::Write(S"Waiting for a connection... ");

            // Perform a blocking call to accept requests.
            // You could also user server.AcceptSocket() here.
            TcpClient* client = server->AcceptTcpClient();            
            Console::WriteLine(S"Connected!");

            data = 0;

            // Get a stream Object* for reading and writing
            NetworkStream* stream = client->GetStream();

            Int32 i;

            // Loop to receive all the data sent by the client.
            while (i = stream->Read(bytes, 0, bytes->Length)) {   
                // Translate data bytes to a ASCII String*.
                data = Text::Encoding::ASCII->GetString(bytes, 0, i);
                Console::WriteLine(String::Format(S"Received: {0}", data));

                // Process the data sent by the client.
                data = data->ToUpper();

                Byte msg[] = Text::Encoding::ASCII->GetBytes(data);

                // Send back a response.
                stream->Write(msg, 0, msg->Length);
                Console::WriteLine(String::Format(S"Sent: {0}", data));            
            }

            // Shutdown and end connection
            client->Close();
        }
    } catch (SocketException* e) {
        Console::WriteLine(S"SocketException: {0}", e);
    }

    Console::WriteLine(S"\nHit enter to continue...");
    Console::Read();

	return 0;
}

What can I do to solve it so the program will compile?

I'm coding in c++ and compile and code in Microsoft Visual Studio .NET 2003