Why isn’t Session available in my event handlers in global.asax?
It depends on which event you’re handling. Session is available only after AcquireRequestState event
Can two different programming languages be mixed in a single ASPX file?
No. ASP.NET uses parsers to strip the code from ASPX files and copy it to temporary files containing derived Page classes, and a given parser understands only one language
Is it possible to use a style sheet class directly on a control instead of using inline or page-level formatting ?
Every WebControl derived control has a CssClass property which allows you to set it’s format to a style sheet.
Does ASP.Net still recognize the global.asa file?
ASP.Net does not recognize the standard ASP global.asa file. Instead it uses a file named global.asax with the same – plus additional – functionality.
Where can I get information on Cookies in ASP.NET
Refer Mike Pope’s article Basics of Cookies in ASP.NET