How can I make my own application on top in the start menu?

my demo source：
<Window x:Class="WpfTopmost.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowStyle="None"
AllowsTransparency="True"
Loaded="Window_Loaded"
Background="Transparent"
Title="MainWindow" Height="130" Width="130">
<Grid Background="Transparent">
<Ellipse Fill="Transparent" Stroke="Green" StrokeThickness="3">



-------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfTopmost
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
///
public partial class MainWindow : Window
{
private Object _thisLock = new Object();
public MainWindow()
{
InitializeComponent();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
Thread globalThread = new Thread((ThreadStart)delegate
{
MouseStopTimeSpan();
});
globalThread.IsBackground = true;
globalThread.Start();
}

private void MouseStopTimeSpan()
{
try
{

while (true)
{
try
{
Thread.Sleep(200);
lock (_thisLock)
{
this.Dispatcher.Invoke(new Action(() =>
{
// SetWindowPos(, -1, 0, 0, 0, 0, 0x4000 | 0x0001 | 0x0002); 我以前试过这个效果不太好,所以注掉了
//HwndSource source = (HwndSource)PresentationSource.FromVisual(this);
//IntPtr handle = source.Handle;
//bool b1 = BringWindowToTop(handle);
this.Topmost = false;
//Thread.Sleep(2);
this.Topmost = true;
//HwndSource source = (HwndSource)PresentationSource.FromVisual(this);
//IntPtr handle = source.Handle;
//bool b1 = BringWindowToTop(handle);



//系统所在鼠标位置
MousePosTool.POINT p = new MousePosTool.POINT();
if (MousePosTool.GetCursorPos(out p))//API方法
{
this.Top = p.Y - 65;
this.Left = p.X - 65;
}
}), null);
}
}
catch (Exception ex)
{

MessageBox.Show(ex.Message);
}

}
}
catch (Exception ex)
{

MessageBox.Show(ex.Message);
}
}
}

public static class MousePosTool
{
/// <summary>
/// 设置鼠标的坐标
///
/// <param name="x">横坐标
/// <param name="y">纵坐标
[DllImport("User32")]
public extern static void SetCursorPos(int x, int y);
public struct POINT
{
public int X;
public int Y;
publ

I want to do my own application on top in the window10

my application window show up on top of every other window.On the windows10 operating system.
windows7 and windows8 operating system have succeeded.