Set notepad's text using UI automation w/o setting the focus on it first

UIA_NoFocusSetNotepadText.cs

        static void Main()
        {
            // needs using UIAutomationClient;
            // requires a reference to windows\system32\UIAutomationClient.dll
            // and set Embed Interop Types to false for project reference
            var root = new CUIAutomation8();

            // we want to *keep* the focus
            root.AutoSetFocus = 0; // false

            // notepad must be started
            var notepad = Process.GetProcessesByName("notepad")[0];

            // get notepad window
            var window = root.ElementFromHandle(notepad.MainWindowHandle);

            // get notepad document element
            var document = window.FindFirst(TreeScope.TreeScope_Descendants, root.CreatePropertyCondition(UIA_PropertyIds.UIA_ControlTypePropertyId, UIA_ControlTypeIds.UIA_DocumentControlTypeId));
            var text = (IUIAutomationTextPattern2)document.GetCurrentPattern(UIA_PatternIds.UIA_TextPattern2Id);

            // get document text
            var value = text.DocumentRange.GetText(int.MaxValue);

            // get value pattern & set document value (add date...)
            var pattern = (IUIAutomationValuePattern)document.GetCurrentPattern(UIA_PatternIds.UIA_ValuePatternId);
            pattern.SetValue(value + " " + DateTime.Now);
        }