C# socket programming

public class Network
   {
       public Socket read;
       public IPEndPoint ie;

       public Network(string ip)
       {
           read = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
           ie = new IPEndPoint(IPAddress.Parse(File.ReadAllText("c:\\ipaddress.txt")), 502);
       }


       public bool InitConnection()
       {
           read.Connect(ie);
           return read.Connected;

       }


       public int send(byte[] data)
       {
           return read.Send(data);

       }

       public byte[] receive()
       {
           byte[] data = new byte[41];
           int num = read.Receive(data);
           return data;

       }

       public void close_connection()
       {
           //read.Close();
           read.Shutdown(SocketShutdown.Both);


       }

       public void refreshSocket()
       {
           read.Shutdown(SocketShutdown.Both);

       }


   }

static void main()
   {
  byte[] data = new data[]{0x01,0x02,0x44,0x34,0x23,0x11};
  Networking net = new Networking();
 if(net.InitConnection())
    {
     net.send(data);
     net.receive();
    }
        ////Please note that i have used all the data from the Networking class, while doing so i am receiving  correct data in the receiving buffer. In short every thing works fine.

   }

static void main()
   {
  byte[] data = new data[]{0x01,0x02,0x44,0x34,0x23,0x11};
  byte[] ret = new ret[41];   
 Socket read = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    read.Connect("172.16.3.230", 502);
    read.Send(data);
    read.Receive(ret);
  ////please note here i am explicitly sending the data over the socket i.e directly connecting not through any class. But this time i get an Error. If i do the below thing : 
  foreach(byte b in ret)
  Console.WriteLine(b.ToString("x2"));  

  ///Here the result shows that the data which i receive into the ret buffer is shifted by one position to the right.
  ///for example if received data is : 01 02 03 04, then after shifting: 00 01 02 03.
  /// I have lost the last byte.
 
 /// I am communicating with a PLC device and reading its holding registers. This problem doesnt occur if i read the coils of the PLC device.        


   }