The thumbs.db file is generated by the Windows operating system. It is a database file containing the small images displayed when you view a folder in "thumbnail" view (as opposed to tile, icon, list, or detail view).

 

I think there are some problems related with your user control which cause the dotnetgallery failt to load.

 

Can you create a new project just for testing the dotnetgallery?

 

Keep me posted.