I managed to get the string in Textbox from Java based application using WindowsAccessBridge.dll and C#
but now I'm trying to set string in the same textbox. Is there such a function in WindowsAccessBridge.dll or this library is for read-only functions?
The Java Access Bridge exposes a subset of the full Java Accessibility API. This subset is focused on the needs of Windows screen readers & magnifiers - none of which need to replace text. So... at the present time, this library doesn't provide any "write" functions.