How long does an object in the CodeBehind live?

Question

If I create an object in the code-behind of an .aspx page, how long can I expect that object to live? Will it live across post-backs? Could I pass it somehow to another page? Could I make it live as long as, say, the session object?

I searched the web hoping for a document explaining the life-cycle of objects created from the code-behind, and how to interact with this life-cycle; any related links would be appreciated.

By the way, I am using C# in the code-behind, but I imagine most advice targeting VB would be applicable as well.

Answer 1

If I create an object in the code-behind of an .aspx page, how long can I expect that object to live? Will it live across post-backs? Could I pass it somehow to another page? Could I make it live as long as, say, the session object?

You can save object instances within the session:

Session["Foo"] = new MyFoo();

You can retrieve the instance on any page that has access to the session:

MyFoo foo = (MyFoo) Session["Foo"];

An alternative to this is using a static variable - in this case the variable keeps its value until the app domain gets destroyed (i.e. when IIS is restarted) - but it is also global in the sense that it has the same value for all users (since its not related to the session at all).