ASP.NET - Could not load type Global.asax compilation error

I have a website which was compiling fine.

It has a Global.asax file of the following code:

<%@ Application Codebehind="Global.asax.cs" Inherits="MyClass.Global" %>

Now it is throwing an error: Could not load type 'MyClass.Global'  in the file Global.asax file

I have seen a solution whereby one would change the output folder from: 

Project Properties

 and set the 

build>output

 folder to 

bin/

 which was 

bin/Debug

I just can't find this menu. I saw Property Pages which has a build option - but I can't find anywhere to set the build output to the bin folder.

Can you please guide me to the correct menu.

Thanks.