In Autocomplete textbox how to retrieve appended text

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VB

I use Autocomplete SuggestAppend in relation to a textbox.

Assuming my textbox shows numbers and the dropdown list contains for example
12312
13411
14511
15611

If I type "1" I will see in the textbox "12312" with "2312" appended and the dropdown list showing the options. I can use textbox.Text to get the "1" which I typed.

How can I get the entire textbox value ie "12312" (the "1" and the appended "2312")?

Thanks