Question

I am dynamically adding text in a RichTextBox.

How can I set Focus on the last line so the user can see it?

Answer 1

This will move the caret to the last line:

richTextBox.CaretPosition = richTextBox.Document.ContentEnd;

But it will not scroll the richTextBox to make the caret visible. To accomplish that you also have to call ScrollToEnd():

richTextBox.CaretPosition = richTextBox.Document.ContentEnd;
richTextBox.ScrollToEnd();