Show String on Active Application (Notepad, Word ...) from Windows Service

Thank you for Comment!
1. Any String
2. I try SendKeys.WaitSend... And SendMessage Method Of user32.dll
3. i want to see my string on notepad blank or Word Document...


The code for Example:
GlobalData.SetForegroundWindow(GetTaskWindows()); //user32.dll implements
SendKeys.SendWait(Encoding.Default.GetString(data));

or

GlobalData.SendMessage(GetTaskWindows(), GlobalData.WM_SETTEXT, IntPtr.Zero, _
new StringBuilder(Encoding.Default.GetString(data)));

private IntPtr GetTaskWindows()
{
// Get the desktopwindow handle
IntPtr nDeshWndHandle = GlobalData.GetDesktopWindow();
// Get the first child window
IntPtr nChildHandle = GlobalData.GetForegroundWindow();

return GlobalData.FindWindowEx(nChildHandle, IntPtr.Zero , "Edit", null);
}