Application level events in ASP.NET

http://msdn.microsoft.com/en-us/library/fwzzh56s%28v=vs.100%29.aspx

http://www.dotnetcurry.com/ShowArticle.aspx?ID=126

http://www.c-sharpcorner.com/UploadFile/abhikumarvatsa/create-and-use-application-level-events-in-Asp-Net2/