receive data from c client socket program in linux

Hi everyone, I wrote c client socket program in Linux and c# server program in window. I want to send text from client to server. I can send from c client program by using write() function. But I don't know how to receive in my c# server side. Should I use networkstream? I used networkstream.read but cannot receive it. So if anyone knows a way to get it, pls kindly guide me. Thanks.


my server code is

Code:

---

NetworkStream ns;
private void DataReceived()
{
    int bytesRead = 0;
    byte[] length = new byte[4];
    if(length == null)
    {
        bytesRead =  ns.Read(length, 0 , 4);
        string str = System.Convert.ToString(bytesRead);
        this.Invoke(new MethodInvoker(delegate {textBox2.Text = str; }));
    }
}

---

Is it something wrong in my code? If anyone knows, pls kindly guide me. Thanks.