How to Create Report for Live Site(Asp.Net)?

Hi Asif,
I am a newbie to livesite development. I need to know how to register .net dll as pre-controler for page and site.

In detail, I am working on HP project where live site is deployed on IIS. All the pages have .Page extension My requirement it I need to modify the header element of .Page from .NET code.

I tried two approached.

1. I prepared .NET class library and tried deploying on live site and registered it as Pre-controller but on executing page it throws error of java.lang cannot find class, means it is not finding dll.

So, I need to know how to register .net dll as pre-controler on .page

2. I created user control and registered it with componencts on .page, in which I took context object of live site. I am able to get all the elements of page like title, header etc but I cannot update it. On trying to update it is not throwing error but it also does not modify the content.

I have very high immergency on this requirement so any help would be highly appreciated. Thanks.