string - Textbox, delete button [c#] -

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to add new letter textbox use

textbox.text = textbox.text + " ";

adds space etc., simple

but didnt figured out how can delete last line

for examp.

text of textbox abcdefg

and when user clicks delete, text "abcdef" "adcde" etc.

how can ?

i tried search web failed because dont know how search such thing ^^ 

string text = textbox.text; if(!string.isnullorempty(text))     textbox.text = text.substring(0,text.length-1);

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