.net - How to get previous characters in string -


i creating function allow me previous character in string during loop .

private sub tsbutton_click(sender object, e eventargs) handles tsbutton.click     each ch char in htextdisplay.text         msgbox("the previous characters here")         'carry out function here     next end sub

so if htextdisplay.text "abcdefg" msgbox show "a" "b" "c" .....

on other hand may better if check if there character behind character in function of loop 

dim previouschar char = "" each ch char in htextdisplay.text     msgbox ch & " - previous character = " & previouschar     'other processing     previouschar = ch next

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