C# how to find the number of running instances of a program?

Question

C++ / C#

How can I prevent multiple copies of the program from running?

Answer 1

This is solved by using a named mutex.

Answer 2

static void Main()
        {
            using (var sem = new Semaphore(1, 1, "MyApplication"))
            {
                if (sem.WaitOne(0))
                {
                    Application.EnableVisualStyles();
                    Application.SetCompatibleTextRenderingDefault(false);
                    Application.Run(new MainForm());
                }
                else
                    MessageBox.Show("Программа уже запущена.");
            }

        }

Answer 3

As for me, the most convenient way without semaphores and mutexes is to use the VB library.
An example is here .