SimulateKeystrokes Methode

        [System.Runtime.InteropServices.DllImport("user32.dll")]
        private static extern int SetForegroundWindow(IntPtr toSetWindow);

        [System.Runtime.InteropServices.DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();

        /// <summary>
        /// Benötigter Verweis: System.Windows.Forms
        /// </summary>
        /// <param name="processName">Prozessnahme ohne Dateierweiterung (z.B. .exe)</param>
        /// <param name="keys">https://msdn.microsoft.com/de-de/library/system.windows.forms.sendkeys.send(v=vs.110).aspx</param>
        public static void SimulateKeystrokes(string processName, string keys)
        {
            System.Diagnostics.Process[] processes = System.Diagnostics.Process.GetProcessesByName(processName);
            IntPtr currForegroundWindow = GetForegroundWindow();
            for (int i = 0; i < processes.Length; i++)
            {
                SetForegroundWindow(processes[i].MainWindowHandle);
                System.Windows.Forms.SendKeys.SendWait(keys);
            }
            SetForegroundWindow(currForegroundWindow);
        }