How to debug from a javascript file to dotnet file

To debug Javascript you may try below.

Add debugger; keyword above the line from where you want to start debugging.

function Test() {

            debugger;
            var abc = 'something';
        }

1) IE - Click on Tools -> Internet Options -> Advanced

Uncheck below options.
a) Disable script debugging (Internet Explorer)
b) Disable script debugging (Other)

2) Firefox - You can debug using Firebug - Script Tab.