does not exist in the namespace 'System' error

i'm studying part of unity Network basic.

and coding example source.

few days ago i find the source one of example.

after coding run this example. i have some errors...

the general error is does not exist in the namespace 'System'...

i check the spell, folder. files...

i can't 'System.Net.IPAddress' file...

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Net.Sockets;
4. using System.Net;
5.  
6. public class SimpleClient : MonoBehaviour {
7.    
8.     public string m_IPAddress = "127.0.0.1";
9.     public const int kPort =10523;
10.     private static SimpleClient singleton;
11.     private Socket m_socket;
12.    
13.    
14.     void Awake()
15.     {
16.         //소켓을 생성합니다.
17.         m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
18.         System.Net.IPAddress
19.                 remoteIPAddress = System.IPAddress.Parse(m_IPAddress);
20.         System.Net.IPEndPoint
21.             remoteEndPoion = new System.Net.IPEndPoint(remoteIPAddress, kPort);
22.         singleton = this;
23.         //서버에 연결 요청을 합니다.
24.         m_Socket.Connect(remoteEndPoint);
25.         Debug.Log("Connecting");
26.     }
27.    
28.     void OnApplicationQuit()
29.     {
30.         m_Socket.Close();
31.         m_Socket = null;
32.     }
33.    
34.     void Update()
35.     {
36.         //마우스가 왼쪽 클릭 때마다 현재 마우스 좌표와 Hello 문자열을 서버에게 보냄.
37.         if(Input.GetMouseButtonUp(0))
38.         {
39.             MessageData newmsg = new MessageData();
40.             newmsg.stringData = "hello";
41.             newmsg.mousex = Input.mousePosition.x;
42.             newmsg.mousey = Input.mousePosition.y;
43.             newmsg.type = 0;
44.             SimpleClient.Send(newmsg);
45.     }
46.    
47. }
48.    
49.     static public void Send(MessageData msgData)
50.     {
51.         if(singleton.m_Socket == null)
52.             return;
53.        
54.         byte[] sendData = MessageData.ToByteArray(msgData);
55.         byte[] prefix = new byte[1];
56.         prefix[0] =(byte)sendData.Length;
57.         singleton.m_Socket.Send(prefix);
58.         singleton.m_Socket.Send(sendData);
59.         //LOG
60.         Debug.Log(msgData.stringData + " " + msgData.mousex.ToString() + " " + msgData.mousey.ToString() );
61.     }
62. }

and my unity version is 4.0.0f7

 

On line 19, you have

That should be

Though, since you have System.Net in your using statements, all of the instances of System.Net. could just be removed, and it will still work fine.

 

why you constantly write namespaces even if you have incapsulated it in the usings?

Code (CSharp):

1. remoteIPAddress = System.Net.IPAddress.Parse(m_IPAddress);

You can simply write:

Code (CSharp):

1. remoteIPAddress = IPAddress.Parse(m_IPAddress);

Because the namespace is declared in the top lines of the file.