XML : Posting text from one text box into another, each post is placed on top of the previous

I am working on a WPF project which allows one to enter a comment in one text box, and when s/he presses a button the comment written is posted into another textbox, aside from this the last comment posted needs to be posted on the previous so if for example comment 1 is posted at 10pm and the other at 11pm the 11 pm comment is put on top of the 10 pm comment, any suggestions ?

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