C# - StreamReader.ReadLine does not work properly!

Question

Simply I have been trying to implement what BufferedStreamReader does in Java. I have a socket stream open and just want to read it in a line-oriented fashion -

Answer 1

    public string READS()
    {
        byte[] buf = new byte[CLI.Available];//set buffer
        CLI.Receive(buf);//read bytes from stream
        string line = UTF8Encoding.UTF8.GetString(buf);//get string from bytes
        return line;//return string from bytes
    }
    public void WRITES(string text)
    {
        byte[] buf = UTF8Encoding.UTF8.GetBytes(text);//get bytes of text
        CLI.Send(buf);//send bytes
    }

CLI is a socket. for some rezone the TcpClient class doesn't work right on my pc any more, but the Socket class works just fine.

UTF-8 is the stranded StreamReader / Writer Encoding