I am wondering if anyone else has had this issue with visual studio (or a VS extension because I have a few installed) and what is causing this? The number goes away when I clos
I don't have significant reputation to comment, but I am experiencing this both with VS2013 and VS2015 too. The only extension I have installed is Resharper.
My research shows that it is caused by the hover text / overlays from various components. The only way I have found to get rid of them is to close the Visual Studio IDE window responsible.
I figured it out!
This has been bothering me for years. I finally just sat down and solved the problem. Basically, VS has this little known feature where you can navigate through code lens with just your keyboard. If you press Alt for a couple of seconds, you will see numbers just like the ones that appear at the top of your screen above your current method. To fix it, just long press Alt again and the number should go away. If you have many VS instances open you might have to go through them one by one.