C# – 防止重覆啟動程式

//Program.cs

public static Queue<string> Messages = new Queue<string>();
static string appGuid = "{af80bd69-73bc-4148-9377-87b6ab52bed5}";//自行設定的GUID

[STAThread]
static void Main()
{
    using(Mutex m = new Mutex(false, "Global\\" + appGuid))
    {
        if(!m.WaitOne(0, false))
        {
             MessageBox.Show("Program is running!");
             return;
        }
        else
        {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             Application.Run(new Form1());
        }
    }
}