There are plenty of textboxes inside Microsoft system which can all be used
with .Net (sometimes using interoperability) assuming hat it is a
windows.forms textbox than the answer is simple.
Just set the SelectionStart and SelectionLength properties.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.