Please see my comment to the question: it is not clear what are you trying to do, and how ASP.NET and WPF application can be related. I have an impression that you are trying to do something totally wrong, but cannot be quite sure because of the very vague question.
If you have some working ASP.NET application you are trying to re-use with different front end, probably you should think about or creating an ASP.NET Web service you would consume by your WPF front-end application, or, better yet, to create a WCF service hosted by IIS and also consume it by your your WPF front-end.
Please see:
http://msdn.microsoft.com/en-us/library/ms972326.aspx[
^].
These CodeProject articles could be useful:
Understanding the Basics of Web Service in ASP.NET[
^],
ASP.NET Web Service[
^].
On WCF services, please see:
http://msdn.microsoft.com/en-us/library/bb332338.aspx[
^],
http://msdn.microsoft.com/en-us/library/aa751792.aspx[
^],
http://msdn.microsoft.com/en-us/library/ms733766.aspx[
^].
These CodeProject articles could be useful:
Create, Host (Self Hosting, IIS hosting) and Consume WCF Service[
^],
What's the Difference between WCF and Web Services?[
^].
—SA