User-762694769 posted
What do you mean by "merge"? Do you want just an aspx file with only inline code and no code file (.aspx.vb)?
Or do you want the generated assemblies to not have a separate aspx file that contains the code? For example, when you precompile a web site, the default behavior is that the aspx and aspx.vb each is a partial class, and gets compiled into the same assembly.
If you compile using updatable mode, only the code file gets compiled, the aspx is not compiled until it is actually requested.