You can use visual studio to extend the broader capabilities of DotNetNuke, but you don't really modify dotnetnuke code in that process.

Mike

Hello,

Those things are done by creating a custom module. 

I think that some of your confusion might be coming from the nature of DotNetNuke. DotNetNuke isn't like a traditional web site in the sense that you add pages and work on them in visual studio. Instead, it's a framework - that framework provides a lot, but, you need to work within the rules of the framework. 

In DNN, rather than creating a page to do your custom work, you create a module. In that module, you can do all the things you are talking about - put in your boxes, manage your db connections, etc. Then, you install the module as a plug in to DNN and place your module into a DNN page - just like how you added the HTML module to change text. It's just that now, you'll have the "Deepak" module in your list (or whatever you want to call it). 

There are some tutorials out there on module development. You might check these:

• http://www.dotnetnuke.com/Resources/V...
• http://www.dotnetnuke.com/Resources/W...

Hope this helps,

Mike