why not just create a custom handler for all the textboxes?
addhandler textbox1.textchanged, addressof textchangedhandler
addhandler textbox2.textchanged, addressof textchangedhandler
addhandler textbox7.textchanged, addressof textchangedhandler
For the customer handling routine
private sub TextchangedHandler(ByVal sender As System.Object, ByVal e As System.EventArgs)
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