I often hear in English conversation or movies the contraction "ain't" (for "isn't"), but I am more surprised to see it in writing (and I am not referring to a novel, where I can understand its usage: convey common oral expressions in a text)
See this question (on a technical forum) for instance:
There ain’t
ListBox.SelectionMode=“None”
, is there another way to disable selection in a listbox?
Is it appropriate in that context (formal written technical question)?