set the panel scrolled by loading an image as background

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C#

WinForms

Hi,I have a picture which is so big.I want the user to load it in a panel as background and I want the scollbars of the panel apear when the user loads the picture.
In other words, I want to have a scrollable panel so that when the user loades a picture_which is bigger than the panel size_ as background, the scrollbar apears.
what's the solution?
Thanks in advance
Updated:
I should add that I want to allow the user to draw on that panel so I have to call myPanel.invalidate many times .I think when I call invalidate, The panel is drown again from the top of it.