How Seperates Bussiness logic and Http Calls in WEB API?

You can definitely call this method from another class.

 

Have you already tried? If yes, how? Please share calling code attempt.

 

A bit of abstraction is required in your code by implementing data access layer. I am not seeing business logic there at all but it is always safer to have one more layer. These layers are nothing but more classes. In many cases nothing much but a call to lower layer methods.