C#

public byte[] ENC(string strdata, CspParameters prk)
      {
          RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(prk);
          byte[] data = rsa.Encrypt(Encoding.Unicode.GetBytes(strdata),false);
          MessageBox.Show(data.Length.ToString());/////test
          return data;
      }

void clint(byte[] data)
        {
            try
            {

                object op = (object)data;
                BinaryFormatter br = new BinaryFormatter();
                TcpClient myclient = new TcpClient("192.168.43.152", 7000);// server to conecting
                NetworkStream myns = myclient.GetStream();
                br.Serialize(myns, op);
                myclient.Close();
                

            }
            catch (Exception e)
            {
                
                clint(data);
            }
        }

CspParameters cp = new CspParameters();
                   cp.KeyContainerName = "25522100";
                   string usb = ":RIO";

                   string Name = System.Environment.MachineName;

                   Name += usb;

                   mymsg = ENC(Name, cp);


                   clint(mymsg);

<pre> mytcp = new TcpListener(7000);
                mytcp.Start();
                mysocket = mytcp.AcceptSocket();
                myns = new NetworkStream(mysocket);
                BinaryFormatter br = new BinaryFormatter();
                object op;
                op = br.Deserialize(myns);
                data = (byte[])op;
                MessageBox.Show(data.Length.ToString());
CspParameters cp = new CspParameters();
                cp.KeyContainerName = "25522100";
byte[] messge = DEC(data, cp);

public byte[] DEC(byte[] en_data, CspParameters key)
     {
         RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(key);
         byte[] data1 = rsa.Decrypt(en_data, false);
         return data1;
     }

namespace Send_Key
{
    class Program
    {
        [DllImport("user32.dll", SetLastError = true, EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        [DllImport("user32.dll", SetLastError = true, EntryPoint = "SetForegroundWindow")]
        static extern bool SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32.dll", SetLastError = true, EntryPoint = "ShowWindow")]
        static extern bool ShowWindow(IntPtr hWnd, int cmCommand);
        static IntPtr hwnd;


        static void Main(string[] args)
        {
            Process notePad = new Process();
            notePad.StartInfo.FileName = "notepad.exe";
            notePad.Start();

            System.Threading.Thread.Sleep(1000);

            SetForegroundWindow(hWnd);

            System.Threading.Thread.Sleep(1000);
            SendKeys.Send("Hello World!");
        }
    }
}