Program Cisco switches by C#

Hi
I want to use System.Net.Sockets.TcpClient class in .Net framework to configure a Cisco switch or router. Does anyone has any samples or how to?
I already have written the below code. When I run it, I don't get what I expect.

public class Cisco
    {
        private TcpClient _client;
 
        //private event EventHandler<
 
        private TcpClient Client
        {
            get
            {
                if (_client == null)
                    _client = new TcpClient();
                return _client;
            }
        }
 
        public Cisco(IPEndPoint endPoint)
        {
            Client.Connect(endPoint);
            var s = Read();
        }
 
        public string RunCommand(string command)
        {
            if (!command.EndsWith("\r\n"))
                command = string.Format("{0}\r\n", command);
            var buffer = ASCIIEncoding.ASCII.GetBytes(command);
            Client.GetStream().Write(buffer, 0, buffer.Length);
            var s = Read();
            return s;
        }
 
        private string Read()
        {
            var buffer = new Byte[Client.ReceiveBufferSize];
            var read = new List<string>();
            while (Client.GetStream().DataAvailable)
            {
                var state = new object[] { Client.GetStream(), buffer, null };
                var ia = Client.GetStream().BeginRead(buffer, 0, buffer.Length, new AsyncCallback(Read), state);
                ia.AsyncWaitHandle.WaitOne();
                read.Add(ASCIIEncoding.ASCII.GetString(buffer.Take((int)((object[])ia.AsyncState)[2]).ToArray()));
            }
            return string.Concat(read.ToArray());
        }
 
        private void Read(IAsyncResult ar)
        {
            var state = ar.AsyncState as object[];
            var stream = state[0] as NetworkStream;
            var buffer = state[1] as byte[];
            var br = stream.EndRead(ar);
            state[2] = br;
        }
    }
 
     static void Main(string[] args)
        {
             Cisco c = new Cisco(new IPEndPoint(IPAddress.Parse("172.16.1.147"), 23));
            Console.Write(c.RunCommand("PASSWORD"));
            Console.Write(c.RunCommand("enable"));
            Console.Write(c.RunCommand("ENABLE PASSWORD"));
            Console.Write(c.RunCommand("show run"));
            Console.Write(c.RunCommand("exit"));
            Console.Read();
        }

Select allOpen in new window