Not Working over LAN and Internet but working in local computer i.e. LOCALHOST

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.Remoting;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Soap;
using System.Runtime.InteropServices;
namespace remoteclass
{


    public class xx : MarshalByRefObject
    {

        public int sum(int a, int b)
        {

            return a + b;

        }

        private static Bitmap bmpScreenshot;
        int k = 0;
        private static Graphics gfxScreenshot;

        public MemoryStream screenshot()
        {
            bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);

            // Create a graphics object from the bitmap

            gfxScreenshot = Graphics.FromImage(bmpScreenshot);

            // Take the screenshot from the upper left corner to the right bottom corner

            gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);

            // Save the screenshot to the specified path that the user has chosen

            //pictureBox1.Image = bmpScreenshot;
               // bmpScreenshot.Save("e:\\screen.png", ImageFormat.Png);

            MemoryStream ms = new MemoryStream();
            SoapFormatter formatter = new SoapFormatter();
            formatter.Serialize(ms, bmpScreenshot);
            ms.Position = 0;



            return ms;






        }
        [DllImport("winmm.dll", EntryPoint = "mciSendStringA")]
        public static extern void mciSendStringA(string lpstrCommand,
               string lpstrReturnString, long uReturnLength, long hwndCallback);
        string rt = "";
        public void EjectCdTray()
        {
            mciSendStringA("set CDAudio door open", rt, 127, 0);
        }
        public void CloseCdTray()
        {
            mciSendStringA("set CDAudio door closed", rt, 127, 0);
        }
        public void CursorSet(int X, int Y)
        {
            Cursor.Position = new Point(X,Y);
        }

    }


}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Runtime.Remoting;

using System.Runtime.Remoting.Channels;

using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters.Soap;
using System.Threading;



namespace remoteclient
{

    public partial class Form1 : Form
    {

        //TcpChannel ch = new TcpChannel();

        remoteclass.xx obj = new remoteclass.xx();

        public Form1()
        {

            InitializeComponent();

        }





        private void button1_Click_1(object sender, EventArgs e)
        {
            try
            {
                //ChannelServices.RegisterChannel(ch);

                obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),

                               "tcp://"+txtPath.Text+":8085/Ankit");

                int x = Int32.Parse(textBox1.Text);

                int y = Int32.Parse(textBox2.Text);

                textBox3.Text = (obj.sum(x, y)).ToString();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.Width = this.Width-36;
            pictureBox1.Height = this.Height - 48-36;

        }



        remoteclass.xx abc = new remoteclass.xx();
        private void timer1_Tick(object sender, EventArgs e)
        {
            try
            {
                ////abc.screenshot(pictureBox1);
                //obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),
                //    "tcp://" + txtPath.Text + ":8085/Ankit");
                //SoapFormatter formatter = new SoapFormatter();
                ////System.IO.MemoryStream ms = new System.IO.MemoryStream();
                ////ms = obj.screenshot();

                ////ms.Position = 0;
                ////obj.screenshot().Position = 0;
                //pictureBox1.Image = (Bitmap)formatter.Deserialize(obj.screenshot());
                //obj.screenshot().Close();

                if(!backgroundWorker1.IsBusy)
                backgroundWorker1.RunWorkerAsync();


            }
            catch (Exception ex)
            {
                timer1.Enabled = false;

                MessageBox.Show(ex.ToString());

            }

        }

        private void Form1_Resize(object sender, EventArgs e)
        {
            pictureBox1.Width = this.Width-36;
            pictureBox1.Height = this.Height - 48-36;
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            try
            {
                //abc.screenshot(pictureBox1);
                obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),
                    "tcp://" + txtPath.Text + ":8085/Ankit");
                SoapFormatter formatter = new SoapFormatter();
                //System.IO.MemoryStream ms = new System.IO.MemoryStream();
                //ms = obj.screenshot();

                //ms.Position = 0;
                //obj.screenshot().Position = 0;
                e.Result = (Bitmap)formatter.Deserialize(obj.screenshot());
                //obj.screenshot().Close();

            }
            catch (Exception ex)
            {
                timer1.Enabled = false;

                MessageBox.Show(ex.ToString());

            }
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            pictureBox1.Image = (Bitmap)e.Result;


        }

        private void btnEject_Click(object sender, EventArgs e)
        {
            try
            {
                obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),

                                   "tcp://" + txtPath.Text + ":8085/Ankit");
                obj.EjectCdTray();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            try
            {
                obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),

                                   "tcp://" + txtPath.Text + ":8085/Ankit");
                obj.CloseCdTray();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            try
            {

                if (timer1.Enabled)
                {
                    obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),
                                       "tcp://" + txtPath.Text + ":8085/Ankit");
                    int X = e.X * pictureBox1.Image.Size.Width / pictureBox1.Size.Width;
                    int Y = e.Y * pictureBox1.Image.Size.Height / pictureBox1.Size.Height;
                    obj.CursorSet(X, Y);
                }
            }
            catch
            {

            }
        }
        int rndMouse;
        private void btnRndm_Click(object sender, EventArgs e)
        {
            try
            {
                rndMouse = 0;
                obj = (remoteclass.xx)Activator.GetObject(typeof(remoteclass.xx),
                                           "tcp://" + txtPath.Text + ":8085/Ankit");
                Random random = new Random();
                while (rndMouse == 0)
                    obj.CursorSet(random.Next(pictureBox1.Image.Width), random.Next(pictureBox1.Image.Height));
            }
            catch
            {
            }

        }

        private void btnMouseStop_Click(object sender, EventArgs e)
        {
            rndMouse = 1;
        }


    }

}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using Microsoft.Win32;


namespace remoteserver
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            TcpChannel ch = new TcpChannel(8085);

            ChannelServices.RegisterChannel(ch);

            RemotingConfiguration.RegisterWellKnownServiceType(typeof

                           (remoteclass.xx), "Ankit", WellKnownObjectMode.Singleton);
            //RegistryKey rkApp = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true);
            //if(rkApp.GetValue("RemoteServer")==null)
            //rkApp.SetValue("RemoteServer", Application.ExecutablePath.ToString());

        }
    }
}