Active process ignoring child process

class ActiveProcess
    {
        [DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();
        [DllImport("user32.dll")]
        private static extern Int32 GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
        private static Process GetProcessByHandle(IntPtr hwnd)
        {
            try
            {
                uint processID;
                GetWindowThreadProcessId(hwnd, out processID);
                return Process.GetProcessById((int)processID);
            }
            catch { return null; }
        }
        private static Process GetActiveProcess()
        {
            IntPtr hwnd = GetForegroundWindow();
            return hwnd != null ? GetProcessByHandle(hwnd) : null;
        }



        public bool IsRunning(string File)
        {
            bool Loadcative = false;
            try
            {
                Process currentProcess = GetActiveProcess();
                var query = string.Format("SELECT ParentProcessId FROM Win32_Process WHERE ProcessId = {0}", currentProcess.Id);
                var search = new ManagementObjectSearcher("root\\CIMV2", query);
                var results = search.Get().GetEnumerator();
                var queryObj = results.Current;
                uint parentId = (uint)queryObj["ParentProcessId"];
                var parent = Process.GetProcessById((int)parentId);
                if ((parent.ProcessName == File))
                    Loadcative = false;
                else
                    Loadcative = true;
            }
            catch { }
            return Loadcative;

        }
    }

[DllImport("user32.dll")]
     static extern bool SetForegroundWindow(IntPtr hWnd);



     private void Tmr_CheckMap_Tick(object sender, EventArgs e)
     {
         string filetocheck = "enterparentfilenamehere";
         Process currentProcess = Process.GetCurrentProcess();
         Process[] pname1 = Process.GetProcessesByName(filetocheck);
         ActiveProcess AP = new ActiveProcess();

         if (pname1.Length != 0 && AP.IsRunning(filetocheck))
         {
             SetForegroundWindow(pname1[0].MainWindowHandle);
         }
      }