Win exception play

            IntPtr hWnd = IntPtr.Zero;
            foreach (Process pList in Process.GetProcesses())
            {
                if (pList.MainWindowTitle.Contains("Return "))
                {
                    hWnd = pList.MainWindowHandle;
                    break;
                }
            }

            try
            {
                StringBuilder sb = new StringBuilder(1);
                GetWindowText(hWnd, sb, 100);
            }
            catch
            {
                throw;
            }