Are you a Windows 8 or Windows RT user? Are you looking for a code to change your Windows 8 lock screen programmatically? Then this post will be definitely helpful for you. Just follow the simple steps to write an application by which you can change it easily.
Windows 8 already exposes settings panel to change the lock screen of the Windows, but this post will help you to programmatically access that using the exposed APIs.
After installing Windows 8 RTM, I was facing an issue that says "Windows can't activate right now. Try activating Windows later". I tried it multiple times but couldn't figure out what was the actual issue here.