C# Hitachi Projector remote control - sending command via network

I am helping my church to develop a simple C# Projector control desktop application. (without pay)

The targeted projector is Hitachi Projector - CP-WX3014N supporting sending RS-232 command via network.

The main function of the application include power on/off and changing the input source.

From the operation manual, I have found the following information: "content.etilize.com/user-manual/1020465953.pdf" 

While I am new in this area, I would like to ask whether there are any good examples or tutorials I can look at or take as reference before starting my work. (I have done a search from google but can't find good tutorial or source code related to this area)

Thanks very much and any help is appreciate.

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I have tried to develop the C# code as below, please kindly advise whether the code is appropriate.

        public static byte[] StringToByteArray(String hex)
        {
            int NumberChars = hex.Length / 2;
            byte[] bytes = new byte[NumberChars];
            using (var sr = new StringReader(hex))
            {
                for (int i = 0; i < NumberChars; i++)
                    bytes[i] =
                      Convert.ToByte(new string(new char[2] { (char)sr.Read(), (char)sr.Read() }), 16);
            }
            return bytes;
        }

        static string SendCommand(String value)
        {

             Int32 port = 23;
             String hostname = "192.168.0.254";
             String responseData = String.Empty;
            try
            {
                TcpClient client = new TcpClient(hostname, port);

                

                Byte[] data = StringToByteArray(value);

                NetworkStream stream = client.GetStream();
                              stream.Write(data, 0, data.Length);

                data = new Byte[8];  

                Int32 bytes = stream.Read(data, 0, data.Length);
                responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);

                stream.Close();
                client.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            return responseData ;
        }

Code for powering on the projector

String value = "BE EF 03 06 00 2A D3 01 00 00 60 01 00";
SendCommand(value);