Operating on text ...

First, the textbox' MultiLine property needs to be set to True. Here is a rough way of getting the results you want: First, get the length of the text after it has been entered. Then do the math: Estimate how many characters will fit across the textbox of a desired size using the selected font and fontsize. Divide the length of the current text by the character number of one line. Figure out what pixel size is needed to fit that many lines. Change the height of the textbox using your figures. Good luck.