Access windows application on website

Im not positive about this answer, but the following is what I would do (may not be the best answer out there):

I would take the application logic, and go through it to make an ASP.NET Class library to use as a code behind page. This way the code is reusable (im sure that there will be some adjustment necessary to the code for ASP.Net)

I cannot say if this is the proper solution to your question ( and if it is not, i am sorry for waisting your time with this reply )

best of luck to you.