drawing on a picturebox...and keeping it drawn

[Jim Bancroft]

I'm trying to draw a red rectangle over a picturebox, with some luck.
Problem is, the rectangle only flashes, then disappears, as though a repaint
keeps taking it away. Here's a code snippet from my method:

pictureBox1.CreateGraphics().FillRectangle(bsh, new Rectangle(x, y, 30,
30));
pictureBox1.Invalidate(new Rectangle(x,y,30, 30));
pictureBox1.Refresh();

I've tried various things...invalidating the entire picturebox, calling
Update() instead of Refresh...everything but the kitchen sink. I guess I
need a better grounding in what to do in situations like this. My paint()
method on the form is generic, I haven't done anything to it. Thanks for
the help!

 

[Kevin Spencer]

You're not overriding the OnPaint method. So, after you draw on it, and call
Refresh, it repaints itself.

--
HTH,

Kevin Spencer
Microsoft MVP
Software Composer
http://unclechutney.blogspot.com

If the Truth hurts, wear it.

 

[Jim Bancroft]

Thanks, Kevin. Should I put the code below in the OnPaint method itself, or
is there another technique I should follow?

 

[Kevin Spencer]

Yes, override the OnPaint method. This way, you're actually controlling the
painting of the Control, each time that it is painted.

--
HTH,

Kevin Spencer
Microsoft MVP
Software Composer
http://unclechutney.blogspot.com

If the Truth hurts, wear it.

 

[Bob Powell [MVP]]

See the GDI+ FAQ #1 most asked question

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

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