static void Main()

         {

             bool bCreatedNew;

             Mutex m = new Mutex(false, "TestClickOnceClientName", out bCreatedNew);

             if (bCreatedNew)

             {

                 Application.EnableVisualStyles();

                 Application.SetCompatibleTextRenderingDefault(false);

                 FrmLogin fLogin = new FrmLogin();

                 if (DialogResult.OK != fLogin.ShowDialog())

                 {

                     return;

                 }

                 FrmMain fe = new FrmMain();

                 fe.ShowDialog();

             }

             CreateDesktopShortCut();

         }

         private static void CreateDesktopShortCut()

         {

             string path = System.Environment.GetFolderPath(Environment.SpecialFolder.StartMenu);

             if (!path.EndsWith("\\"))

             {

                 path += "\\";

             }

             path += @"Programs\Microsoft";

             if (System.IO.Directory.Exists(path))

             {

                 string desktop = System.Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);

                 if (!desktop.EndsWith("\\"))

                 {

                     desktop += "\\";

                 }

                 foreach (String file in System.IO.Directory.GetFiles(path))

                 {

                     System.IO.FileInfo fi = new System.IO.FileInfo(file);

                     if (!System.IO.File.Exists(desktop + fi.Name))

                     {

                         fi.CopyTo(desktop + fi.Name);

                     }

                 }

             }

         }