Run one instance from the application

Question

I have a windows application (C#) and i need to configure it to run one instance from the application at the time , It means that one user clicked the .exe file and the appl

Answer 1

I found this code, it's work!

 /// 

        /// The main entry point for the application.
        /// Limit an app.to one instance
        /// 
        [STAThread]
        static void Main()
        {
            //Mutex to make sure that your application isn't already running.
            Mutex mutex = new System.Threading.Mutex(false, "MyUniqueMutexName");
            try
            {
                if (mutex.WaitOne(0, false))
                {
                    // Run the application
                    Application.EnableVisualStyles();
                    Application.SetCompatibleTextRenderingDefault(false);
                    Application.Run(new Form1());
                }
                else
                {
                    MessageBox.Show("An instance of the application is already running.",
                        "An Application Is Running", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Application Error 'MyUniqueMutexName'", 
                    MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            finally
            {
                if (mutex != null)
                {
                    mutex.Close();
                    mutex = null;
                }
            }
        }