Hello, I have a problem and was wondering if people could help

My web application has a Controller class which contains an entitly class which is to be updated via AJAX over multiple postbacks, I have tried to make it so the controllers are stored in the Global.asax so that they can be accessed by a key (in a hashtable). when i retrieve the controllers they are disposed (ie: null).

Am i approaching this wrong? i really don't get the ASP.NET model it's like rich applications but not

Thanks for your help

Sam