What is the .psess file in my Windows Service?

Question

I've been making changes to a Windows Service in Visual Studio (2010, .NET 4.0 project) and when I go to close the solution or commit to TFS, Visual Studio prompts me to save a .psess file (MyService.psess) that I've never seen before and does not seem to exist yet (a file save dialog pops up prompting me for a location).

I can't find any documentation on this file. What is it? What might I have done to create it? Is it required?

Answer 1

These files generally contain performance profiling session data. You can view the Performance Explorer window to see if you have any open sessions using the menu View->Other Windows->Performance Explorer.

You can delete the sessions there also, if need be.