drawing on the panel (not loosing last paint)

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Hello,I want to draw on a panel(I want the points to be left on the panel where ever I drag on the form. so that I can draw line,circle,etc.) I dont want to loose my last painting when I start to paint again.what's the solution? Thanks in advance.

Posted 4-Dec-11 20:18pm

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Updated 6-Dec-11 8:57am

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Wonde Tadesse 5-Dec-11 12:29pm

Tag it. WPF, WinForm ...

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OriginalGriff · Answer 1 · 2011-12-04T21:10:00

Handle the Panel.Paint event - it is called whenever the panel needs to be redrawn, so any painting you do there will automatically preserved. It hands you the Graphics context in the EventArgs, so you aren't responsible for getting or Disposing the context, and it can be prompted from your code by using the Panel.Invalidate method - so when you change something and it should cause a display change, call Invalidate on the panel, and it will occur.