What are the two methods of backdoor code implementation described in the article?

The article describes two methods: memory loading of .NET assemblies via `test1.aspx`, which decodes and executes a base64-encoded payload from a POST request, and file write via `test2.aspx`, which saves an uploaded file to the server. Both are covered in Penetration Basics - Implementation of Exchange One-Liner Backdoor, and an extension of these techniques is explored in Penetration Basics — Extension of Exchange One-Liner Backdoor.