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

Winforms: RichTextBox.SelectionStart & set RichTextBox.SelectionLength to 0.

WPF: RichTextBox.CaretPosition