how to make a textBox change its height when the number of lines change

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i made usercontrol with two textboxses. one of them is multiline and other textbox is single line which stays at bottom of multiline textbox. i want to change multiline textbox's height based on number of lines of content and stick single line textbox to this multiline textbox visually(no spacing between two textboxes).

asked 1 min ago

user1214354

3

how to make a textBox change its height when the number of lines change