ASP.NET : How can i maintain objects between postbacks?

How can i maintain objects between ASP.NET page post backs ?

I have an ASP.NET web page.when i click one asp.net button, I will call my function (Save ) which will create an object of my custom class (UserDetails class) and save the details to DB.so this is a post back.After the post back again the same page will be displayed to user.At that time,I want to take the User object which i have created in the first function (Save ) . What is the best way to do this ? I know i can store this in a Session and access it. But i want to know whethere there is any other better way ?