Socket issue

I am developing an application in .NET and have tried several examples provided through EE but with limited success. I am trying to pass a command string to a remote device (this part works) and get the return data(this part,...not so good). The problem I have during testing is that when I let the app run through, I get have the data I need from the request; but if I break at the line where the read event is taking place and wait a second or two before letting it go on again I will get the entire string I need. This let me know I need to gather all the packeted data before projecting my string to the application. My question is how do I accomplish this? Thanks ahead of time Experts !

My current code is as follows:

Public Shared Sub socketToMe(ByVal StoreID as String, ByVal IP as String)
     '
     Try
          Dim tcpClient as TcpClient = New System.Net.Sockets.TcpClient()
          tcpClient.Connect(IP,10001)
          '
          Dim TLSCommand as String = (Chr(1) & "i30100")
          Dim sendBytes as Byte() = Encoding.ASCII.GetBytes(TLSCommand)
          Dim networkStream as NetworkStream = tcpClient.GetStream()
          networkStream.Write(sendBytes, 0, sendBytes.Length)
          '
          Dim bytes(tcpClient.ReceiveBufferSize) as Byte
          '
          networkStream.Read(bytes,0, CInt(tcpClient.ReceiveBufferSize))
          '
          Dim returndata as string =Encoding.ASCII.GetString(bytes)
          formLSD.TextBox1.Text = returndata
          '
     Catch ex as Exception
          MsgBox(ex.Message)
     End Try
     '
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