Михаил Светлов пишет:

        private static string _exportMenuKey  =   "Экспорт данных" ;
        private static string _stopExportMenuItem  =   "Остановить экспорт таблиц по &DDE" ;
        private static string _startExportByDDEMenuItem  =   "Начать экспорт таблиц по &DDE" ;

              SetForegroundWindow( Process.GetProcessesByName ( "info" )[ 0 ].MainWindowHandle);
             SendKeys.SendWait ( "^L" );
  

    public class DdeStartStop
    {

        private static string _exportMenuKey = "Экспорт данных";
        private static string _stopExportMenuItem = "Остановить экспорт таблиц по &DDE";
        private static string _startExportByDDEMenuItem = "Начать экспорт таблиц по &DDE";

        private const UInt32 MF_BYPOSITION = 0x00000400;


        [DllImport("user32.dll")]
        private static extern IntPtr GetMenu(IntPtr hWnd);

        [DllImport("user32.dll")]
        private static extern IntPtr GetSubMenu(IntPtr hMenu, int nPos);

        [DllImport("user32.dll")]
        private static extern int GetMenuItemCount(IntPtr hMenu);

        [DllImport("user32.dll")]
        private static extern int GetMenuString(IntPtr hMenu, uint uIDItem, StringBuilder lpString, int nMaxCount, uint uFlag);

        [DllImport("user32.dll")]
        private static extern uint GetMenuItemID(IntPtr hMenu, int nPos);

        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport("user32.dll", SetLastError = true)]

        private static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);


        private static IntPtr[] FindQuikWindow()
        {
            var processes = Process.GetProcessesByName("info");
            var result = new IntPtr[processes.Length];

            for (int i = 0; i < processes.Length; i++)
                result[i] = processes[i].MainWindowHandle;


            return result;
        }

        private static uint FindMenuItemByPart(IntPtr menu, string name)
        {
            int menuItemsCount = GetMenuItemCount(menu);

            for (uint menuIndex = 0; menuIndex < menuItemsCount; menuIndex++)
            {
                var result = new StringBuilder();
                GetMenuString(menu, menuIndex, result, 1024, MF_BYPOSITION);

                string buffer = result.ToString();

                if (buffer.Contains(name))
                {
                    return menuIndex;
                }
            }
            return 0;
        }

        public static bool StartDDE()
        {
            IntPtr[] quikWindows = FindQuikWindow();

            if (quikWindows.Length == 0)
                return false;


            foreach (var quikWindow in quikWindows)
            {
                try
                {
                    IntPtr mainMenu = GetMenu(quikWindow);
                    int exportMenuIndex = (int)FindMenuItemByPart(mainMenu, _exportMenuKey);
                    IntPtr exportMenu = GetSubMenu(mainMenu, exportMenuIndex);
                    uint exportIndex = 6;
                    uint menuItem = GetMenuItemID(exportMenu, (int)exportIndex);
                    PostMessage(quikWindow, 0x111, (IntPtr)menuItem, (IntPtr)0);
                }
                catch (Exception)
                {
                }
            }

            return true;
        }

        public static bool StopDDE()
        {
            IntPtr[] quikWindows = FindQuikWindow();

            if (quikWindows.Length == 0)
                return false;


            try
            {
                foreach (var quikWindow in quikWindows)
                {
                    IntPtr mainMenu = GetMenu(quikWindow);
                    int exportMenuIndex = (int)FindMenuItemByPart(mainMenu, _exportMenuKey);
                    IntPtr exportMenu = GetSubMenu(mainMenu, exportMenuIndex);

                    uint exportIndex = 7;
                    uint menuItem = GetMenuItemID(exportMenu, (int)exportIndex);

                    PostMessage(quikWindow, 0x111, (IntPtr)menuItem, (IntPtr)0);
                }
            }
            catch (Exception) {}

            return true;
        }

    }
 

            SetForegroundWindow(Process.GetProcessesByName("info")[0].MainWindowHandle);
            SendKeys.SendWait("^L");