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copied!<p>The <code>UserContext</code>instance is saved in Session with this line:</p> <pre><code>System.Web.HttpContext.Current.Session["UserContext"] = uc; </code></pre> <p>It's not a singleton. The static property <code>UserContext</code> will attempt to retrieve a instance from Session, and if it doesn't find it, create a new instance and store it in Session.</p> <p><strong>UPDATE</strong></p> <blockquote> <p>I can see how the session var is retrieved, my confusion is around how the session var is set.</p> </blockquote> <p>To add clarification following Micah's comment: the first time the static Current property is accessed, a new UserContext instance is created, its User property is populated with a new User instance, and the UserContext instance is stored in Session. Subsequent accesses to <code>UserContext.Current</code> (and hence <code>UserContext.Current.User</code>) in the same session are all accessing the same instance.</p> <p>If it's still not clear I suggest stepping through with a debugger.</p> <pre><code>public static UserContext Current { get { // If Session does not yet contain a UserContext instance ... if (System.Web.HttpContext.Current.Session["UserContext"] == null) { // ... then create and initialize a new UserContext instance ... UserContext uc = new UserContext(); uc.User = new User(); // ... and store it in Session where it will be available for // subsequent requests during the same session. System.Web.HttpContext.Current.Session["UserContext"] = uc; } // By the time we get here, Session contains a UserContext instance, // so return it. return (UserContext)System.Web.HttpContext.Current.Session["UserContext"]; } } </code></pre>

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