I download the sample project and then the latest source code and noticed that the user controls(ascx files) are outdated when comparing the sample project and actual source files. I am really confused!

Can anyone help me?

I guess with the latest source files you mean the master branch of our GitHub repository?

If you need the source package of the current release download the Source Package

Download 

The Master branch is at the moment is the current devlopment branch for the version 2.3.0