System.Web 1.0.5000.0 2.0.0.0 Gtk# is thread aware, but not thread safe; See the <link location="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details. System.Web.SessionState.IRequiresSessionState Implement the interface in your custom handler to identify that your handler requires only read access to session-state values. Specifies that the target HTTP handler requires only read access to session-state values. This is a marker interface and has no methods.