Question

I get that mistake.. I use a loop to run through a bunch of images to be drawn..I also use multithreading..

What could cause that problem and how could it be prevented?

I use winforms

Additional information:

it tells me if i use graphics after GetHDv method, call the ReleaseHDC method..

What does it mean?

section of the code:

A thread created like this:

Before I did this:
BackgroundWorker1.RunWorkerAsync();

Now I am testing with this:

Backgroundworker back=new backgroundworker();
back.runworkerAsync();

is that the root of the exception?

Answer 1

According to this page

What’s really happening with “Object is currently in use elsewhere” is
that GDI+ is complaining that the device context (DC) that it is
trying to use is already “in use”. With WinForms, this generally
means there is a recursive Graphics.GetHdc occurring. GetHdc must
match a ReleaseHdc before any other GetHdc.

And

You can encounter this exception if you’re drawing to a form from
multiple threads. You’ll likely also be encountering a
cross-threading exception as well. The solution in this case is to
not use multiple threads when accessing a form, including drawing.