How to properly send data over TcpClient?

Why NetworkStream.write sends bytearray as integers one integer at a time? Currently I'm using TcpClient() that connects to java server using the following code.

 private function ThreadListener(){
     client = new TcpClient();
     var port = 16304;
 
     try{
         client.Connect(IPEndPoint(IPAddress.Parse("127.0.0.1"), port));
     
         ns = client.GetStream();
     
         var data = new byte[1024];
      
         var waitCounter = 0;
      
         var read = 0;
      
         while(running){
             do{
                 try{
                     read = ns.Read(data, 0, data.Length);
                     var word = System.Text.Encoding.ASCII.GetString(data, 0, read);
                     Action(word);
                 }
                 catch(err){
                 print(err.Message);
                 }
            } while(ns.CanRead);
        }
 }      
 catch (InvOpEx : InvalidOperationException) {
     Debug.Log("TCP exception: " + InvOpEx.Message);
 }
       
 catch (SockEx : SocketException) {
     Debug.Log("Socket exception: " + SockEx.Message);
 }
 finally {
     if(ns != null)
           ns.Close();
     client.Close();
 }
 }

After that's done I can send data over that NetworkStream ns. But the problem in the following:

 static function SendData(data : String){
 var bytes : byte[] = System.Text.Encoding.ASCII.GetBytes(data);
 if(ns.CanWrite){
     ns.Write(bytes, 0, bytes.Length);
 }
 }

is that when I transform that string into a byte array and receive it on the server side (Java) using InputStream, it only gets the sent data one byte at a time, and it receives the data in Integer format.