Hi Fernik,

I searched this problem in the Internet. Some resources I found said this
problem is caused by the interoperation between managed and unmanaged code.

Could you tell me what the function of your WinForm control is and what the
control does internally?

It's really hard for me to address a problem if I don't have a sample that
could reproduce the problem on my side.

If possible, would you please create a simple sample project that could
just reproduce the problem and send it to me? To get my actual email
address, remove 'online' from my displayed email address.

Thank you for your understanding and cooperation!

Sincerely,
Linda Liu
Microsoft Online Community Support

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Hi Fernik,

I found a  post that produces almost the same exception as your WinForm
control. A workaround is also provided in that post.

You may refer to it through the following link:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=911603&SiteID=1

Hope this helps.

Sincerely,
Linda Liu
Microsoft Online Community Support