I am new to Sharepoint. I am using Sharepoint designer 2013. There is an existing ASP.NET application hosted in IIS. I am able to find Login.aspx in C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\TEMPLATE\LAYOUTS\customLoginPage path. But how to locate it's corresponding Login.aspx.cs file?
I know we don't host .cs file. We register it in GAC. But I want to take this file on my local machine, make some changes and re-host the application. How can I do it? Please help.