What is the event called for closing window in Javascript?

Onbeforeunload
Reference: https://developer.mozilla.org/en-US/docs/Web/API/window.onbeforeunload

window.onbeforeunload = function(e) {
  return 'Dialog text here.';
};

Fix the 3 silent performance killers for IIS / ASP.NET apps

http://mvolo.com/fix-the-3-high-cpu-performance-problems-for-iis-aspnet-apps/

In Visual Studio, how to make post build event only happening in DEBUG mode?

Add a condition like:
if $(ConfigurationName) == Debug "$(TargetDir)i18n.PostBuild.exe" "$(ProjectDir)"

Formula.js

JavaScript implementation of most formula functions supported by Microsoft Excel 2013 and Google Spreadsheets

http://stoic.com/formula/

Realtime Map by SignalR

http://techbrij.com/realtime-google-maps-bing-xml-signalr-file-changes