How hosting a VB6 EXE in C# winform

// Global Var ---------------
public string TabName;
public const int GWL_STYLE = -16;
public const uint WS_VISIBLE = 0x10000000;
// ---------------------------

private void radButtonElement3_Click(object sender, EventArgs e)
        {
         //Creeate New Tab in Telerik PageView
            TabName = radButtonElement3.Text;
            Telerik.WinControls.UI.RadPageViewPage Tab = new Telerik.WinControls.UI.RadPageViewPage(TabName);
            radPageView1.Pages.Add(Tab);
            radPageView1.SelectedPage = Tab;


            IntPtr appWin;
            appWin = IntPtr.Zero;

            string exeName = Application.StartupPath + "\\" + "VB6.exe";

            Process p = null;
            try
            {

                // Start the process
                p = System.Diagnostics.Process.Start(exeName);
             

                // Wait for process to be created and enter idle condition
                p.WaitForInputIdle();

                // Get the main handle
                appWin = p.MainWindowHandle;               
                
            }
            catch (Exception ex)
            {
                MessageBox.Show(this, ex.Message, "Error");
            }
                                
           
            //set new Handel 
            IntPtr _newHandler = radPageView1.Pages[(radPageView1.Pages.Count) - 1].Handle;

            SetParent(p.MainWindowHandle, _newHandler);
            SetWindowLong(_newHandler, GWL_STYLE, WS_VISIBLE);
            MoveWindow(_newHandler, 0, 0, radPageView1.Pages[0].Size.Width, radPageView1.Pages[0].Size.Height, true);
        
        }


// define user32.dll ---------------------------------------
[DllImport("user32.dll", EntryPoint = "GetWindowThreadProcessId", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = true,
             CallingConvention = CallingConvention.StdCall)]
        private static extern long GetWindowThreadProcessId(long hWnd, long lpdwProcessId);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("User32.dll")]
        public static extern int GetClassLong(IntPtr hWnd, int index);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern long SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", EntryPoint = "GetWindowLongA", SetLastError = true)]
        private static extern long GetWindowLong(IntPtr hwnd, int nIndex);

        [DllImport("user32.dll", EntryPoint = "SetWindowLongA", SetLastError = true)]
        private static extern long SetWindowLong(IntPtr hwnd, int nIndex, long dwNewLong);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern long SetWindowPos(IntPtr hwnd, long hWndInsertAfter, long x, long y, long cx, long cy, long wFlags);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool MoveWindow(IntPtr hwnd, int x, int y, int cx, int cy, bool repaint);

        [DllImport("user32.dll", EntryPoint = "PostMessageA", SetLastError = true)]
        private static extern bool PostMessage(IntPtr hwnd, uint Msg, long wParam, long lParam);