Service References Vs Web References in .Net?

Web References: - 

This is old style. It is deprecated asp.net web service (ASMX) technology. It allows communicating with any service based on any technology that implement the WS-I Basic profile 1.1, and exposes the relevant metadata as WSDL.

Service References :- It is new way of doing it, adding a WCF Service reference, which give you more advance, more flexible service model than plain old ASMX.

It allows communicating with any service based on any technology that implements any of the many protocol supported by WCF (not limited to WS-I Basic profile 1.1).

If you want to still use web references , right click on project -> add service reference -> click on Advanced button(left downside) -> new popup window will come -> click on Add web Service Reference (left downside)-> new popup window will come  in that you paste your service url.

See below fig:-