Question

I have a class which inherits from the System.Web.UI.Page class, like mysystem.
When I try to create an instance of mysystem in a winform appplication it throws an HttpException:

Session state can only be used when
enableSessionState is set to true,
either in a configuration file or in
the Page directive. Please also make
sure that
System.Web.SessionStateModule or a
custom session state module is
included in the
<configuration>\<system.web>\<httpModules>
section in the application
configuration.

I then googled this problem and try to enable the session state, but all are not affected.

So, can anybody tell me how to solve this case?

Answer 1

Any class that inherits from System.Web.UI.Page will attempt to utilise parts of the asp.net runtime when it’s instantiated, so when it’s used in a winforms application, it just won’t work.

If there are methods that you need inside this class from another DLL, I’d suggest refactoring them into a separate class as:

• If you want to use them in a winforms app, they’re almost certainly not specific to the page so should be shared anyway
• There’s no good reason to try and use the asp.net runtime (other than, perhaps, caching) inside a winforms application