RichTextBox C# Set caret location winforms

Question

I am building a chat application where the user enters its text to a richtextbox.

In the rich text box there is an initial text which says: \"Me: \".

Now, when

Answer 1

Use the Select method:

public void Select(
    int start,
    int length
)

richTextBoxUserText.Select(richTextBoxUserText.TextLength, 0);