Visual Studio 2013: What do the number suffixes in the file tabs mean?
tabs, user-interface, visual-studio-2013
Solution
The numbers indicate different views of a file. You can open additional views from the main VS menu Window - New Window.
As for why they appear by themselves for .aspx files, it could be a bug in VS. I also heard about this problem from a colleague.
Problem
I just upgraded from VS2010 to VS2013 and now once in a while I will see a number in some of my tabs: I searched Google, MSDN and here with no avail to an answer. Any idea what these numbers mean?