Invalid parameter when setting an image

Question

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?

Answer 1

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.