Dynamic Web Page in ASP.Net

I am working on a project, where a web page created is created dynamically.  I am not able to understand how the data is populated, how the methods are executed etc.

i don't really have an example to give as we can find those from googling it, but in general, web content are hosted in a web server and the content are displayed based on what we want to show. in some scenarios, such content are presented dynamically either via client side technologies (such as JavaScript) or server side technologies (such as web controls in ASP.NET that pulling the content by writing server side scripting, such as C#/ VB.NET)

to answer your question, first you need to determine what web technologies and architectures you want to use in your project. such as MVC, RESTful web service, jQuery, database to be used, mobile responsiveness and other frameworks you can think of.

Thank you Ryan,  
FYI, this is an existing project, I have been asked to make changes.  Here I am not able to understand how the data is coming to the page.  I debugged many times.  There are many methods, where they are never called in the Solution at all.  But still during debug the cursor steps into those methods.  One such example is InstantiateIn.  Please let me know if you have any questions.

Thank you!

you may keep debugging and it should step into next lines of code. by doing it you should know the sequence of your scripts on how it was executing.

also, within your project, try to check the web.config and find connectionstring tags, you may get some clues on how/where your data are pulling from.

Ryan,
Thank you for your help.  I know very well how to debug and good knowledge about web.config file.  Just stuck here.

Thank you!

Reason already provided above.