C#

if (IsSingleInstance())
           {
               Application.EnableVisualStyles();
               Application.SetCompatibleTextRenderingDefault(false);
               Application.Run(new Form1(Args));
           }
           else
           {
               Process current = Process.GetCurrentProcess();
               foreach (Process process in Process.GetProcessesByName(current.ProcessName))
               {
                   if (process.Id != current.Id)
                   {
                       SetForegroundWindow(process.MainWindowHandle);
                       break;
                   }
               }
           }

[STAThread]
        static void Main(string[] Args)
        {

static bool IsSingleInstance()
    {
        try
        {
            // Try to open existing mutex.
            Mutex.OpenExisting(@"Global\Notepad");
        }
        catch
        {
            // If exception occurred, there is no such mutex.
            Program._m = new Mutex(true, "Notepad");

            // Only one instance.
            return true;
        }
        // More than one instance.
        return false;
    }
}

i have created a login page by c# in visual studio.

if i want to take it as my system login page,what are the next steps to be done?

With out this login authentication no one could access the system.

I have a asp.net website which I want to run locally without using IIS, through a windows application, 
I want to whether this is possible and know how this is done, please let me know if u have any information in this regard.