How to create a software like folder lock

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You can't, not in C#. You're talking about rewriting the file system, which is written in C++, and even then, there's no easy way to do it. The best way, is to put your files in to protected zips, or some other form of encryption and have a shell extension or similar in C or C++ decrypting the files and delivering them to the file system as needed.

I've created one and it is working perfectly.. Tell me where to upload them?

to be perfectly honest with you, if there are software like FolderLock already available, then I don't see any reason why would you want to create one yourself unless the reason is purely related to learning. There can be several security level issues as well with such an application I would imagine and as Christian pointed out most such software are written in C++ which gives more control over the environment than C#.

Having said that, see if you pick up something from here: LOCK-UNLOCK-C#[^]


Cheers...