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I'm running a .NET 2.0 program on many computers. On one I had this error occurring repeatedly until I reset the application. 

 //line below was throwing the exception this.myButton.BackgroundImage = global::myNamespace.Properties.Resources.myImage;

Exception:

 ExceptionType: ArgumentException Message: Parameter is not valid. Source: System.Drawing StackTrace: at System.Drawing.Image.get_Flags() at System.Windows.Forms.ControlPaint.IsImageTransparent(Image backgroundImage) at System.Windows.Forms.Control.set_BackgroundImageLayout(ImageLayout value)

The resource exists and it works fine once reset. Can anyone provide any insight as to might be happening?

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  • 2
    Possibly the image file got locked by something? Virus scanner pops into mind... Commented Aug 3, 2012 at 12:52
  • Yip, agreed... disable anti-virus Commented Aug 3, 2012 at 12:59
  • @CodingGorilla I'll try that if I can replicate. Commented Aug 3, 2012 at 13:05

2 Answers 2

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I suggest you use Process Monitor to examine real-time activity on the file, and which processes might be locking it. Add a Filter where the Path is the name of the image/resource file; this should quickly show if anything is monkeying around with the file behind your back.

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Yes, this is a 6 year old post! Ran into the same error today, and it took me far longer to fix than it should have. I was actually disposing my image control on startup, so I obviously couldn't adjust its background image on run-time. Might as well double check for that if you're here.

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