How to embed third party exe file in windows application?

using System;
using System.Collections.Generic;vvv
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace DockExeFile
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

        private Process dockProcess;
        private IntPtr hWndOriginalParent;
        private IntPtr hWndDocked;
        private IntPtr hWndParent;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            dockInPanel();
        }
        private void dockInPanel()
        {
            if (hWndDocked != IntPtr.Zero) 
                return;
            hWndParent = IntPtr.Zero;

            System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
            startInfo.UseShellExecute = true;
            startInfo.FileName = "NOTEPAD";
            startInfo.Arguments = @"D:\dock.txt";

            startInfo.WindowStyle = ProcessWindowStyle.Minimized;
            dockProcess = new Process();
            dockProcess = System.Diagnostics.Process.Start(startInfo);

            while (hWndDocked == IntPtr.Zero)
            {
                dockProcess.WaitForInputIdle(1000); //wait 

                dockProcess.Refresh();//update process info

                if (dockProcess.HasExited)
                {
                    return; //abort if the process finished before we got a handle.
                }
                hWndDocked = dockProcess.MainWindowHandle;  //cache the window handle
                hWndOriginalParent = SetParent(hWndDocked, panel1.Handle);
             
                panel1.SizeChanged += new EventHandler(panel1_Resize);
              
                panel1_Resize(new Object(), new EventArgs());
            }
        }

        private void panel1_Resize(object sender, EventArgs e)
        {
            //Change the docked windows size to match its parent's size. 
            MoveWindow(hWndDocked, 0, 0, panel1.Width, panel1.Height, true);            
        }
    }
}