title: Unable to view codebehind in a ascx file
body: <p>I downloaded an open source project in ASP.NET language.</p>
  
  <p>And I couldn't find any Codebehind file for example inside the Login.aspx the Codebehind is Login.aspx.cs but I cant find it anywhere in the source file. and the Line Codebehind="Login.aspx.cs" identified as "File Login.aspx.cs was not found" but yet the function is still working.</p>
  
  <p>Where can I access those .cs file?</p>