По Handle отправляется русский текст, хотя отправлял на английском

SendKeys.SendWait("help");

    [DllImport("user32.dll", SetLastError = true)]
        static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
 
        [DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string lpClassName,
            string lpWindowName);
 
        [DllImport("USER32.DLL")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);
 
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
 
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int PostMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
 
        delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);
 
        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
 
        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool IsWindowVisible(IntPtr hWnd);
 
        [DllImport("user32.dll", SetLastError = true)]
        static extern int GetWindowTextLength(IntPtr hWnd);
 
        List<IntPtr> ListHandles = new List<IntPtr>();
 
        string GetWindowText(IntPtr hWnd)
        {
            int len = GetWindowTextLength(hWnd) + 1;
            StringBuilder sb = new StringBuilder(len);
            len = GetWindowText(hWnd, sb, len);
            return sb.ToString(0, len);
        }
 
        private void btnSearchHwnd_Click(object sender, EventArgs e)
        {
            IntPtr calculatorHandle = FindWindow("Notepad", "Безымянный — Блокнот");
 
            if (calculatorHandle == IntPtr.Zero)
            {
                MessageBox.Show("Calculator is not running.");
                return;
            }
 
            SetForegroundWindow(calculatorHandle);
            SendKeys.SendWait(textBox1.Text);
             SendKeys.Send("{ENTER}");
        }

InputLanguage.CurrentInputLanguage =  InputLanguage.FromCulture(new System.Globalization.CultureInfo("en-US"));