WPF single instance via mutex

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Diagnostics.Eventing.Reader;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;

namespace WpfApp198
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        [DllImport("user32", CharSet = CharSet.Unicode)]
        static extern IntPtr FindWindow(string cls, string win);

        [DllImport("user32")]
        static extern IntPtr SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32")]
        static extern bool IsIconic(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool OpenIcon(IntPtr hWnd);

        protected override void OnStartup(StartupEventArgs e)
        {
            bool isNew;
            var mutex = new Mutex(true, "MySingleInstanceMtx", out isNew);
            if(!isNew) 
            {
                ActivateOtherWindow();
                Shutdown();
            }
        }

        private static void ActivateOtherWindow()
        {
            var other = FindWindow(null, "Single Instance");
            if(other!=IntPtr.Zero)
            {
                SetForegroundWindow(other);
                if(IsIconic(other))
                {
                    OpenIcon(other);
                }
            }
        }
    }
}