Test if application is already running

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I found a solution!

using System.Runtime.InteropServices;
 
const string AppNamedEvent = "APP_NAMED__EVENT";
 
        [DllImport("coredll")]
        private extern static void SetWindowText(IntPtr hwnd, string text);
 
        [DllImport("coredll")]
        private static extern IntPtr FindWindow(string className, string wndName);
 
        [DllImport("coredll.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
 
        [DllImport("coredll.dll", EntryPoint = "CreateEvent", SetLastError = true)]
        private static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);
 
        [DllImport("coredll.dll", EntryPoint = "CloseHandle", SetLastError = true)]
        private static extern IntPtr CloseHandle(IntPtr handle);
 
//Before you do the app.run use the following code
                // makes sure that we have only one run instance
                IntPtr evnt = CreateEvent(IntPtr.Zero, false, false, AppNamedEvent);
                if (Marshal.GetLastWin32Error() != 0)
                {
                    // one instance of application is run, activate it
                    IntPtr hwnd = FindWindow(null, "StartForm");
                    if (hwnd != IntPtr.Zero)
                    {
                       SetForegroundWindow(hwnd);
                    }
                    return;
                }

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Test if application is already running

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