C#最小化到托盘+双击托盘恢复+禁止运行多个该程序

// Hide to system tray  
private void Form1_Resize(object sender, EventArgs e)  
{  
    if (this.WindowState == FormWindowState.Minimized)  
    {  
        this.Hide();  
        this.ShowInTaskbar = false;  
        this.notifyIcon.Visible = true;  
    }  
}  

// Show from system tray  
private void notifyIcon_DoubleClick(object sender, EventArgs e)  
{  
    if (this.WindowState == FormWindowState.Minimized)  
    {  
        this.Show();  
        this.WindowState = FormWindowState.Normal;  
        this.ShowInTaskbar = true;
        notifyIcon.Visible = false;  
    }  
}  

using System;
using System.Windows.Forms;
using System.Threading;

namespace WhoOnline
{
    static class Program
    {
        /// 

        /// 应用程序的主入口点。
        /// 
        [STAThread]
        static void Main()
        {
            Mutex m = new Mutex(false, "Product_Index_Cntvs", out bool bCreatedNew);
            if (bCreatedNew)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1());
            }
            else
            {
                MessageBox.Show("应用程序已经在运行中...");
                System.Threading.Thread.Sleep(1000);
                //  终止此进程并为基础操作系统提供指定的退出代码。
                System.Environment.Exit(1);
            }
        }
    }
}