c# - Hide/show part of the window with a button click -

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i have simple form containing main view , text boxes , "add" button use adding data displayed in main view (and stored in text file). want add little button toggle hiding/showing of adding controls. such button small square containing 2 arrowheads pointing up/down depending on state. how do that?

(i'm sorry terrible title, don't know proper name this. tell me?)

i don't think there's built-in in winforms that. when needed similar, changed height of form...


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