looking for web form code

In a recent search I did in a visual studio 2010 web form application, I tried to do a research on an issue that occurred. I could not find the line of code that caused the problem. I used Internet explorer developer tools to find the line of code. Also I do not see the
javascript code when I am debugging the application. I also would like to look through the code to see if any commands have been deprecated. Thus can you tell me what I do with Visual studio 2010, so I can 'step though' the javascript code and to be able to do a search on the javascipt code?